blob: b8eda700584bfbd25086d898a21b3fd03959030d [file] [log] [blame]
David Howellsf7b422b2006-06-09 09:34:33 -04001/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
Alan Cox526719b2008-10-27 15:19:48 +00008 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
David Howellsf7b422b2006-06-09 09:34:33 -04009 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
David Howells54ceac42006-08-22 20:06:13 -040016 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
David Howellsf7b422b2006-06-09 09:34:33 -040021 */
22
David Howellsf7b422b2006-06-09 09:34:33 -040023#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040036#include <linux/sunrpc/xprtsock.h>
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040037#include <linux/sunrpc/xprtrdma.h>
David Howellsf7b422b2006-06-09 09:34:33 -040038#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
David Howellsf7b422b2006-06-09 09:34:33 -040042#include <linux/seq_file.h>
43#include <linux/mount.h>
Trond Myklebustc02d7ad2009-06-22 15:09:14 -040044#include <linux/namei.h>
David Howellsf7b422b2006-06-09 09:34:33 -040045#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
Chuck Leverfd00a8f2007-12-10 14:57:38 -050048#include <linux/in6.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/slab.h>
Chuck Leverfd00a8f2007-12-10 14:57:38 -050050#include <net/ipv6.h>
Chuck Leverd8e77482008-06-23 12:37:01 -040051#include <linux/netdevice.h>
David Howellsf7b422b2006-06-09 09:34:33 -040052#include <linux/nfs_xdr.h>
Adrian Bunkb5d5dfb2007-02-12 00:53:40 -080053#include <linux/magic.h>
Chuck Leverbf0fd762007-07-01 12:13:44 -040054#include <linux/parser.h>
Stanislav Kinsburskye50a7a12012-01-10 16:12:46 +040055#include <linux/nsproxy.h>
Trond Myklebust2446ab62012-03-01 17:00:56 -050056#include <linux/rcupdate.h>
David Howellsf7b422b2006-06-09 09:34:33 -040057
David Howellsf7b422b2006-06-09 09:34:33 -040058#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
David Howells08734042009-04-03 16:42:42 +010065#include "fscache.h"
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +030066#include "pnfs.h"
Bryan Schumakerab7017a2012-07-30 16:05:16 -040067#include "nfs.h"
David Howellsf7b422b2006-06-09 09:34:33 -040068
69#define NFSDBG_FACILITY NFSDBG_VFS
Bryan Schumakerb72e4f42012-05-10 15:07:40 -040070#define NFS_TEXT_DATA 1
David Howellsf7b422b2006-06-09 09:34:33 -040071
Bryan Schumaker1c606fb2012-07-30 16:05:24 -040072#if IS_ENABLED(CONFIG_NFS_V3)
Paulius Zaleckas1e657bd2010-10-31 18:21:05 +020073#define NFS_DEFAULT_VERSION 3
74#else
75#define NFS_DEFAULT_VERSION 2
76#endif
77
Chuck Leverbf0fd762007-07-01 12:13:44 -040078enum {
79 /* Mount options that take no arguments */
80 Opt_soft, Opt_hard,
Chuck Leverbf0fd762007-07-01 12:13:44 -040081 Opt_posix, Opt_noposix,
82 Opt_cto, Opt_nocto,
83 Opt_ac, Opt_noac,
84 Opt_lock, Opt_nolock,
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -040085 Opt_udp, Opt_tcp, Opt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -040086 Opt_acl, Opt_noacl,
87 Opt_rdirplus, Opt_nordirplus,
Trond Myklebust75180df2007-05-16 16:53:28 -040088 Opt_sharecache, Opt_nosharecache,
Chuck Leverd7403512008-12-23 15:21:37 -050089 Opt_resvport, Opt_noresvport,
David Howellsb797cac2009-04-03 16:42:48 +010090 Opt_fscache, Opt_nofscache,
Chuck Leverbf0fd762007-07-01 12:13:44 -040091
92 /* Mount options that take integer arguments */
93 Opt_port,
94 Opt_rsize, Opt_wsize, Opt_bsize,
95 Opt_timeo, Opt_retrans,
96 Opt_acregmin, Opt_acregmax,
97 Opt_acdirmin, Opt_acdirmax,
98 Opt_actimeo,
99 Opt_namelen,
100 Opt_mountport,
Chuck Levere887cbc2007-10-26 13:32:29 -0400101 Opt_mountvers,
Mike Sager3fd5be92009-04-01 09:21:48 -0400102 Opt_minorversion,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400103
104 /* Mount options that take string arguments */
Trond Myklebust0d71b052012-03-02 13:59:49 -0500105 Opt_nfsvers,
Chuck Lever33832032007-12-10 14:59:13 -0500106 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
Chuck Lever0ac83772007-09-11 18:01:04 -0400107 Opt_addr, Opt_mountaddr, Opt_clientaddr,
Trond Myklebust7973c1f2008-07-15 17:58:14 -0400108 Opt_lookupcache,
David Howellsb797cac2009-04-03 16:42:48 +0100109 Opt_fscache_uniq,
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400110 Opt_local_lock,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400111
Chuck Leverf45663c2008-06-24 19:28:02 -0400112 /* Special mount options */
113 Opt_userspace, Opt_deprecated, Opt_sloppy,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400114
115 Opt_err
116};
117
Steven Whitehousea447c092008-10-13 10:46:57 +0100118static const match_table_t nfs_mount_option_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400119 { Opt_userspace, "bg" },
120 { Opt_userspace, "fg" },
Chuck Leverecbb3842008-06-12 12:37:33 -0400121 { Opt_userspace, "retry=%s" },
122
Chuck Leverf45663c2008-06-24 19:28:02 -0400123 { Opt_sloppy, "sloppy" },
124
Chuck Leverbf0fd762007-07-01 12:13:44 -0400125 { Opt_soft, "soft" },
126 { Opt_hard, "hard" },
Chuck Leverd33e4df2008-06-12 12:37:41 -0400127 { Opt_deprecated, "intr" },
128 { Opt_deprecated, "nointr" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400129 { Opt_posix, "posix" },
130 { Opt_noposix, "noposix" },
131 { Opt_cto, "cto" },
132 { Opt_nocto, "nocto" },
133 { Opt_ac, "ac" },
134 { Opt_noac, "noac" },
135 { Opt_lock, "lock" },
136 { Opt_nolock, "nolock" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400137 { Opt_udp, "udp" },
138 { Opt_tcp, "tcp" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400139 { Opt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400140 { Opt_acl, "acl" },
141 { Opt_noacl, "noacl" },
142 { Opt_rdirplus, "rdirplus" },
143 { Opt_nordirplus, "nordirplus" },
Trond Myklebust75180df2007-05-16 16:53:28 -0400144 { Opt_sharecache, "sharecache" },
145 { Opt_nosharecache, "nosharecache" },
Chuck Leverd7403512008-12-23 15:21:37 -0500146 { Opt_resvport, "resvport" },
147 { Opt_noresvport, "noresvport" },
David Howellsb797cac2009-04-03 16:42:48 +0100148 { Opt_fscache, "fsc" },
David Howellsb797cac2009-04-03 16:42:48 +0100149 { Opt_nofscache, "nofsc" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400150
Chuck Levera5a16ba2009-06-17 18:02:14 -0700151 { Opt_port, "port=%s" },
152 { Opt_rsize, "rsize=%s" },
153 { Opt_wsize, "wsize=%s" },
154 { Opt_bsize, "bsize=%s" },
155 { Opt_timeo, "timeo=%s" },
156 { Opt_retrans, "retrans=%s" },
157 { Opt_acregmin, "acregmin=%s" },
158 { Opt_acregmax, "acregmax=%s" },
159 { Opt_acdirmin, "acdirmin=%s" },
160 { Opt_acdirmax, "acdirmax=%s" },
161 { Opt_actimeo, "actimeo=%s" },
162 { Opt_namelen, "namlen=%s" },
163 { Opt_mountport, "mountport=%s" },
164 { Opt_mountvers, "mountvers=%s" },
Trond Myklebust0d71b052012-03-02 13:59:49 -0500165 { Opt_minorversion, "minorversion=%s" },
166
Chuck Levera5a16ba2009-06-17 18:02:14 -0700167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
Chuck Lever33832032007-12-10 14:59:13 -0500175 { Opt_mounthost, "mounthost=%s" },
Chuck Lever0ac83772007-09-11 18:01:04 -0400176 { Opt_mountaddr, "mountaddr=%s" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400177
Trond Myklebust7973c1f2008-07-15 17:58:14 -0400178 { Opt_lookupcache, "lookupcache=%s" },
Chuck Levera6d5ff62010-05-07 13:33:58 -0400179 { Opt_fscache_uniq, "fsc=%s" },
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400180 { Opt_local_lock, "local_lock=%s" },
Trond Myklebust7973c1f2008-07-15 17:58:14 -0400181
Trond Myklebust38622792012-03-02 14:06:39 -0500182 /* The following needs to be listed after all other options */
183 { Opt_nfsvers, "v%s" },
184
Chuck Leverbf0fd762007-07-01 12:13:44 -0400185 { Opt_err, NULL }
186};
187
188enum {
Jeff Laytonee671b02009-12-03 15:58:56 -0500189 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
Chuck Leverbf0fd762007-07-01 12:13:44 -0400190
191 Opt_xprt_err
192};
193
Steven Whitehousea447c092008-10-13 10:46:57 +0100194static const match_table_t nfs_xprt_protocol_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400195 { Opt_xprt_udp, "udp" },
Jeff Laytonee671b02009-12-03 15:58:56 -0500196 { Opt_xprt_udp6, "udp6" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400197 { Opt_xprt_tcp, "tcp" },
Jeff Laytonee671b02009-12-03 15:58:56 -0500198 { Opt_xprt_tcp6, "tcp6" },
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -0400199 { Opt_xprt_rdma, "rdma" },
Chuck Leverbf0fd762007-07-01 12:13:44 -0400200
201 { Opt_xprt_err, NULL }
202};
203
204enum {
205 Opt_sec_none, Opt_sec_sys,
206 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
207 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
208 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
209
210 Opt_sec_err
211};
212
Steven Whitehousea447c092008-10-13 10:46:57 +0100213static const match_table_t nfs_secflavor_tokens = {
Chuck Leverbf0fd762007-07-01 12:13:44 -0400214 { Opt_sec_none, "none" },
215 { Opt_sec_none, "null" },
216 { Opt_sec_sys, "sys" },
217
218 { Opt_sec_krb5, "krb5" },
219 { Opt_sec_krb5i, "krb5i" },
220 { Opt_sec_krb5p, "krb5p" },
221
222 { Opt_sec_lkey, "lkey" },
223 { Opt_sec_lkeyi, "lkeyi" },
224 { Opt_sec_lkeyp, "lkeyp" },
225
Olga Kornievskaia8d042212008-02-13 16:47:06 -0500226 { Opt_sec_spkm, "spkm3" },
227 { Opt_sec_spkmi, "spkm3i" },
228 { Opt_sec_spkmp, "spkm3p" },
229
Chuck Leverbf0fd762007-07-01 12:13:44 -0400230 { Opt_sec_err, NULL }
231};
232
Trond Myklebust7973c1f2008-07-15 17:58:14 -0400233enum {
234 Opt_lookupcache_all, Opt_lookupcache_positive,
235 Opt_lookupcache_none,
236
237 Opt_lookupcache_err
238};
239
240static match_table_t nfs_lookupcache_tokens = {
241 { Opt_lookupcache_all, "all" },
242 { Opt_lookupcache_positive, "pos" },
243 { Opt_lookupcache_positive, "positive" },
244 { Opt_lookupcache_none, "none" },
245
246 { Opt_lookupcache_err, NULL }
247};
248
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400249enum {
250 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
251 Opt_local_lock_none,
252
253 Opt_local_lock_err
254};
255
256static match_table_t nfs_local_lock_tokens = {
257 { Opt_local_lock_all, "all" },
258 { Opt_local_lock_flock, "flock" },
259 { Opt_local_lock_posix, "posix" },
260 { Opt_local_lock_none, "none" },
261
262 { Opt_local_lock_err, NULL }
263};
264
Trond Myklebust0d71b052012-03-02 13:59:49 -0500265enum {
266 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
267 Opt_vers_4_1,
268
269 Opt_vers_err
270};
271
272static match_table_t nfs_vers_tokens = {
273 { Opt_vers_2, "2" },
274 { Opt_vers_3, "3" },
275 { Opt_vers_4, "4" },
276 { Opt_vers_4_0, "4.0" },
277 { Opt_vers_4_1, "4.1" },
278
279 { Opt_vers_err, NULL }
280};
Chuck Leverbf0fd762007-07-01 12:13:44 -0400281
Al Viro31f43472010-10-29 03:38:12 -0400282static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data);
David Howellsf7b422b2006-06-09 09:34:33 -0400284
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400285struct file_system_type nfs_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400286 .owner = THIS_MODULE,
287 .name = "nfs",
Al Viro01194982011-03-16 07:25:36 -0400288 .mount = nfs_fs_mount,
David Howellsf7b422b2006-06-09 09:34:33 -0400289 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400291};
Bryan Schumakerddda8e02012-07-30 16:05:23 -0400292EXPORT_SYMBOL_GPL(nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400293
David Howells54ceac42006-08-22 20:06:13 -0400294struct file_system_type nfs_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400295 .owner = THIS_MODULE,
296 .name = "nfs",
Al Viro31f43472010-10-29 03:38:12 -0400297 .mount = nfs_xdev_mount,
David Howellsf7b422b2006-06-09 09:34:33 -0400298 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400300};
301
Bryan Schumaker6a744902012-07-30 16:05:20 -0400302const struct super_operations nfs_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400303 .alloc_inode = nfs_alloc_inode,
304 .destroy_inode = nfs_destroy_inode,
305 .write_inode = nfs_write_inode,
Trond Myklebust387c1492010-02-03 08:27:35 -0500306 .put_super = nfs_put_super,
David Howellsf7b422b2006-06-09 09:34:33 -0400307 .statfs = nfs_statfs,
Al Virob57922d2010-06-07 14:34:48 -0400308 .evict_inode = nfs_evict_inode,
David Howellsf7b422b2006-06-09 09:34:33 -0400309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
Al Viroc7f404b2011-03-16 06:59:40 -0400311 .show_devname = nfs_show_devname,
312 .show_path = nfs_show_path,
David Howellsf7b422b2006-06-09 09:34:33 -0400313 .show_stats = nfs_show_stats,
Jeff Layton48b605f2008-06-10 15:38:39 -0400314 .remount_fs = nfs_remount,
David Howellsf7b422b2006-06-09 09:34:33 -0400315};
Bryan Schumakerddda8e02012-07-30 16:05:23 -0400316EXPORT_SYMBOL_GPL(nfs_sops);
David Howellsf7b422b2006-06-09 09:34:33 -0400317
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400318#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -0400319static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
Bryan Schumakerd72c7272012-05-10 15:07:41 -0400320static int nfs4_validate_mount_data(void *options,
321 struct nfs_parsed_mount_data *args, const char *dev_name);
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400322
323struct file_system_type nfs4_fs_type = {
324 .owner = THIS_MODULE,
325 .name = "nfs4",
326 .mount = nfs_fs_mount,
327 .kill_sb = nfs_kill_super,
328 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
329};
330EXPORT_SYMBOL_GPL(nfs4_fs_type);
331
332static int __init register_nfs4_fs(void)
333{
334 return register_filesystem(&nfs4_fs_type);
335}
336
337static void unregister_nfs4_fs(void)
338{
339 unregister_filesystem(&nfs4_fs_type);
340}
341#else
342static int __init register_nfs4_fs(void)
343{
344 return 0;
345}
346
347static void unregister_nfs4_fs(void)
348{
349}
David Howellsf7b422b2006-06-09 09:34:33 -0400350#endif
351
Rusty Russell8e1f9362007-07-17 04:03:17 -0700352static struct shrinker acl_shrinker = {
353 .shrink = nfs_access_cache_shrinker,
354 .seeks = DEFAULT_SEEKS,
355};
Trond Myklebust979df722006-07-25 11:28:19 -0400356
David Howellsf7b422b2006-06-09 09:34:33 -0400357/*
358 * Register the NFS filesystems
359 */
360int __init register_nfs_fs(void)
361{
362 int ret;
363
364 ret = register_filesystem(&nfs_fs_type);
365 if (ret < 0)
366 goto error_0;
367
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400368 ret = register_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400369 if (ret < 0)
370 goto error_1;
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400371
372 ret = nfs_register_sysctl();
373 if (ret < 0)
374 goto error_2;
Rusty Russell8e1f9362007-07-17 04:03:17 -0700375 register_shrinker(&acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400376 return 0;
377
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400378error_2:
379 unregister_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400380error_1:
381 unregister_filesystem(&nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400382error_0:
383 return ret;
384}
385
386/*
387 * Unregister the NFS filesystems
388 */
389void __exit unregister_nfs_fs(void)
390{
Rusty Russell8e1f9362007-07-17 04:03:17 -0700391 unregister_shrinker(&acl_shrinker);
Alexey Dobriyan49af7ee2007-09-18 22:46:40 -0700392 nfs_unregister_sysctl();
bjschuma@gmail.com1ae811e2012-08-08 13:57:06 -0400393 unregister_nfs4_fs();
David Howellsf7b422b2006-06-09 09:34:33 -0400394 unregister_filesystem(&nfs_fs_type);
395}
396
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400397void nfs_sb_active(struct super_block *sb)
Steve Dicksonef818a22007-11-08 04:05:04 -0500398{
399 struct nfs_server *server = NFS_SB(sb);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400400
401 if (atomic_inc_return(&server->active) == 1)
402 atomic_inc(&sb->s_active);
403}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400404EXPORT_SYMBOL_GPL(nfs_sb_active);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400405
406void nfs_sb_deactive(struct super_block *sb)
407{
408 struct nfs_server *server = NFS_SB(sb);
409
410 if (atomic_dec_and_test(&server->active))
411 deactivate_super(sb);
Steve Dicksonef818a22007-11-08 04:05:04 -0500412}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400413EXPORT_SYMBOL_GPL(nfs_sb_deactive);
Steve Dicksonef818a22007-11-08 04:05:04 -0500414
David Howellsf7b422b2006-06-09 09:34:33 -0400415/*
416 * Deliver file system statistics to userspace
417 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400418int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
David Howellsf7b422b2006-06-09 09:34:33 -0400419{
David Howells0c7d90c2006-08-22 20:06:10 -0400420 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400421 unsigned char blockbits;
422 unsigned long blockres;
David Howells0c7d90c2006-08-22 20:06:10 -0400423 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400424 struct nfs_fsstat res;
425 int error = -ENOMEM;
426
427 res.fattr = nfs_alloc_fattr();
428 if (res.fattr == NULL)
429 goto out_err;
David Howellsf7b422b2006-06-09 09:34:33 -0400430
David Howells8fa5c002006-08-22 20:06:12 -0400431 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
Menyhart Zoltanfbf3fdd2010-09-12 19:55:26 -0400432 if (unlikely(error == -ESTALE)) {
433 struct dentry *pd_dentry;
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400434
Menyhart Zoltanfbf3fdd2010-09-12 19:55:26 -0400435 pd_dentry = dget_parent(dentry);
436 if (pd_dentry != NULL) {
437 nfs_zap_caches(pd_dentry->d_inode);
438 dput(pd_dentry);
439 }
440 }
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400441 nfs_free_fattr(res.fattr);
David Howellsf7b422b2006-06-09 09:34:33 -0400442 if (error < 0)
443 goto out_err;
Trond Myklebustca7e9a02010-04-16 16:22:52 -0400444
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700445 buf->f_type = NFS_SUPER_MAGIC;
David Howellsf7b422b2006-06-09 09:34:33 -0400446
447 /*
448 * Current versions of glibc do not correctly handle the
449 * case where f_frsize != f_bsize. Eventually we want to
450 * report the value of wtmult in this field.
451 */
David Howells0c7d90c2006-08-22 20:06:10 -0400452 buf->f_frsize = dentry->d_sb->s_blocksize;
David Howellsf7b422b2006-06-09 09:34:33 -0400453
454 /*
455 * On most *nix systems, f_blocks, f_bfree, and f_bavail
456 * are reported in units of f_frsize. Linux hasn't had
457 * an f_frsize field in its statfs struct until recently,
458 * thus historically Linux's sys_statfs reports these
459 * fields in units of f_bsize.
460 */
David Howells0c7d90c2006-08-22 20:06:10 -0400461 buf->f_bsize = dentry->d_sb->s_blocksize;
462 blockbits = dentry->d_sb->s_blocksize_bits;
David Howellsf7b422b2006-06-09 09:34:33 -0400463 blockres = (1 << blockbits) - 1;
464 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
465 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
466 buf->f_bavail = (res.abytes + blockres) >> blockbits;
467
468 buf->f_files = res.tfiles;
469 buf->f_ffree = res.afiles;
470
471 buf->f_namelen = server->namelen;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700472
David Howellsf7b422b2006-06-09 09:34:33 -0400473 return 0;
474
475 out_err:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700476 dprintk("%s: statfs error = %d\n", __func__, -error);
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700477 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400478}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400479EXPORT_SYMBOL_GPL(nfs_statfs);
David Howellsf7b422b2006-06-09 09:34:33 -0400480
David Howells7d4e2742006-08-22 20:06:07 -0400481/*
482 * Map the security flavour number to a name
483 */
Trond Myklebust81039f12006-06-09 09:34:34 -0400484static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
485{
David Howells7d4e2742006-08-22 20:06:07 -0400486 static const struct {
Trond Myklebust81039f12006-06-09 09:34:34 -0400487 rpc_authflavor_t flavour;
488 const char *str;
489 } sec_flavours[] = {
490 { RPC_AUTH_NULL, "null" },
491 { RPC_AUTH_UNIX, "sys" },
492 { RPC_AUTH_GSS_KRB5, "krb5" },
493 { RPC_AUTH_GSS_KRB5I, "krb5i" },
494 { RPC_AUTH_GSS_KRB5P, "krb5p" },
495 { RPC_AUTH_GSS_LKEY, "lkey" },
496 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
497 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
498 { RPC_AUTH_GSS_SPKM, "spkm" },
499 { RPC_AUTH_GSS_SPKMI, "spkmi" },
500 { RPC_AUTH_GSS_SPKMP, "spkmp" },
Chuck Lever4d81cd12007-07-01 12:12:40 -0400501 { UINT_MAX, "unknown" }
Trond Myklebust81039f12006-06-09 09:34:34 -0400502 };
503 int i;
504
Chuck Lever4d81cd12007-07-01 12:12:40 -0400505 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
Trond Myklebust81039f12006-06-09 09:34:34 -0400506 if (sec_flavours[i].flavour == flavour)
507 break;
508 }
509 return sec_flavours[i].str;
510}
511
Jeff Laytonee671b02009-12-03 15:58:56 -0500512static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
513 int showdefaults)
514{
515 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
516
517 seq_printf(m, ",mountproto=");
518 switch (sap->sa_family) {
519 case AF_INET:
520 switch (nfss->mountd_protocol) {
521 case IPPROTO_UDP:
522 seq_printf(m, RPCBIND_NETID_UDP);
523 break;
524 case IPPROTO_TCP:
525 seq_printf(m, RPCBIND_NETID_TCP);
526 break;
527 default:
528 if (showdefaults)
529 seq_printf(m, "auto");
530 }
531 break;
532 case AF_INET6:
533 switch (nfss->mountd_protocol) {
534 case IPPROTO_UDP:
535 seq_printf(m, RPCBIND_NETID_UDP6);
536 break;
537 case IPPROTO_TCP:
538 seq_printf(m, RPCBIND_NETID_TCP6);
539 break;
540 default:
541 if (showdefaults)
542 seq_printf(m, "auto");
543 }
544 break;
545 default:
546 if (showdefaults)
547 seq_printf(m, "auto");
548 }
549}
550
Chuck Lever82d101d2008-03-14 14:10:37 -0400551static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
552 int showdefaults)
553{
554 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
555
Bryan Schumakerd5eff1a2010-08-03 13:04:00 -0400556 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
557 return;
558
Chuck Lever82d101d2008-03-14 14:10:37 -0400559 switch (sap->sa_family) {
560 case AF_INET: {
561 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
Harvey Harrisonbe859402008-10-31 00:56:28 -0700562 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400563 break;
564 }
565 case AF_INET6: {
566 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
Chuck Leverd250e192009-12-03 15:58:56 -0500567 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
Chuck Lever82d101d2008-03-14 14:10:37 -0400568 break;
569 }
570 default:
571 if (showdefaults)
572 seq_printf(m, ",mountaddr=unspecified");
573 }
574
575 if (nfss->mountd_version || showdefaults)
576 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
Stanislav Kinsburskyaa699472010-12-08 12:40:13 +0300577 if ((nfss->mountd_port &&
578 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
579 showdefaults)
Chuck Lever82d101d2008-03-14 14:10:37 -0400580 seq_printf(m, ",mountport=%u", nfss->mountd_port);
581
Jeff Laytonee671b02009-12-03 15:58:56 -0500582 nfs_show_mountd_netid(m, nfss, showdefaults);
Chuck Lever82d101d2008-03-14 14:10:37 -0400583}
584
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400585#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust0be81892010-06-18 12:23:58 -0400586static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
587 int showdefaults)
588{
589 struct nfs_client *clp = nfss->nfs_client;
590
591 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
Trond Myklebust0be81892010-06-18 12:23:58 -0400592}
593#else
594static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
595 int showdefaults)
596{
597}
598#endif
599
Trond Myklebust7bbceb62012-03-02 14:00:20 -0500600static void nfs_show_nfs_version(struct seq_file *m,
601 unsigned int version,
602 unsigned int minorversion)
603{
604 seq_printf(m, ",vers=%u", version);
605 if (version == 4)
606 seq_printf(m, ".%u", minorversion);
607}
608
David Howellsf7b422b2006-06-09 09:34:33 -0400609/*
610 * Describe the mount options in force on this server representation
611 */
Chuck Lever82d101d2008-03-14 14:10:37 -0400612static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
613 int showdefaults)
David Howellsf7b422b2006-06-09 09:34:33 -0400614{
David Howells509de812006-08-22 20:06:11 -0400615 static const struct proc_nfs_info {
David Howellsf7b422b2006-06-09 09:34:33 -0400616 int flag;
David Howells509de812006-08-22 20:06:11 -0400617 const char *str;
618 const char *nostr;
David Howellsf7b422b2006-06-09 09:34:33 -0400619 } nfs_info[] = {
620 { NFS_MOUNT_SOFT, ",soft", ",hard" },
Chuck Lever82d101d2008-03-14 14:10:37 -0400621 { NFS_MOUNT_POSIX, ",posix", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400622 { NFS_MOUNT_NOCTO, ",nocto", "" },
623 { NFS_MOUNT_NOAC, ",noac", "" },
624 { NFS_MOUNT_NONLM, ",nolock", "" },
625 { NFS_MOUNT_NOACL, ",noacl", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400626 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
Chuck Leverd7403512008-12-23 15:21:37 -0500627 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
628 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400629 { 0, NULL, NULL }
630 };
David Howells509de812006-08-22 20:06:11 -0400631 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400632 struct nfs_client *clp = nfss->nfs_client;
Chuck Lever82d101d2008-03-14 14:10:37 -0400633 u32 version = clp->rpc_ops->version;
Suresh Jayaraman7c563cc2010-09-23 14:26:48 -0400634 int local_flock, local_fcntl;
David Howellsf7b422b2006-06-09 09:34:33 -0400635
Trond Myklebust7bbceb62012-03-02 14:00:20 -0500636 nfs_show_nfs_version(m, version, clp->cl_minorversion);
Chuck Lever2d767432008-03-14 14:10:08 -0400637 seq_printf(m, ",rsize=%u", nfss->rsize);
638 seq_printf(m, ",wsize=%u", nfss->wsize);
Chuck Lever82d101d2008-03-14 14:10:37 -0400639 if (nfss->bsize != 0)
640 seq_printf(m, ",bsize=%u", nfss->bsize);
641 seq_printf(m, ",namlen=%u", nfss->namelen);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400642 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400643 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400644 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400645 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400646 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400647 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
Chuck Lever0e0cab72008-06-26 17:47:12 -0400648 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
Chuck Lever2d767432008-03-14 14:10:08 -0400649 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
David Howellsf7b422b2006-06-09 09:34:33 -0400650 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
651 if (nfss->flags & nfs_infop->flag)
652 seq_puts(m, nfs_infop->str);
653 else
654 seq_puts(m, nfs_infop->nostr);
655 }
Trond Myklebust2446ab62012-03-01 17:00:56 -0500656 rcu_read_lock();
\"Talpey, Thomas\56928ed2007-09-10 13:48:47 -0400657 seq_printf(m, ",proto=%s",
Jeff Laytonee671b02009-12-03 15:58:56 -0500658 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500659 rcu_read_unlock();
Chuck Lever82d101d2008-03-14 14:10:37 -0400660 if (version == 4) {
661 if (nfss->port != NFS_PORT)
662 seq_printf(m, ",port=%u", nfss->port);
663 } else
664 if (nfss->port)
665 seq_printf(m, ",port=%u", nfss->port);
666
Trond Myklebust33170232007-12-20 16:03:59 -0500667 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
668 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
Trond Myklebust81039f12006-06-09 09:34:34 -0400669 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
Chuck Lever82d101d2008-03-14 14:10:37 -0400670
671 if (version != 4)
672 nfs_show_mountd_options(m, nfss, showdefaults);
Trond Myklebust0be81892010-06-18 12:23:58 -0400673 else
674 nfs_show_nfsv4_options(m, nfss, showdefaults);
Chuck Lever82d101d2008-03-14 14:10:37 -0400675
David Howellsb797cac2009-04-03 16:42:48 +0100676 if (nfss->options & NFS_OPTION_FSCACHE)
677 seq_printf(m, ",fsc");
Patrick J. LoPresti9b00c642010-08-10 17:28:01 -0400678
679 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
680 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
681 seq_printf(m, ",lookupcache=none");
682 else
683 seq_printf(m, ",lookupcache=pos");
684 }
Suresh Jayaraman7c563cc2010-09-23 14:26:48 -0400685
686 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
687 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
688
689 if (!local_flock && !local_fcntl)
690 seq_printf(m, ",local_lock=none");
691 else if (local_flock && local_fcntl)
692 seq_printf(m, ",local_lock=all");
693 else if (local_flock)
694 seq_printf(m, ",local_lock=flock");
695 else
696 seq_printf(m, ",local_lock=posix");
David Howellsf7b422b2006-06-09 09:34:33 -0400697}
698
699/*
700 * Describe the mount options on this VFS mountpoint
701 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400702int nfs_show_options(struct seq_file *m, struct dentry *root)
David Howellsf7b422b2006-06-09 09:34:33 -0400703{
Al Viro34c80b12011-12-08 21:32:45 -0500704 struct nfs_server *nfss = NFS_SB(root->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400705
706 nfs_show_mount_options(m, nfss, 0);
707
Trond Myklebust2446ab62012-03-01 17:00:56 -0500708 rcu_read_lock();
Chuck Lever5d8515c2007-12-10 14:57:16 -0500709 seq_printf(m, ",addr=%s",
710 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
711 RPC_DISPLAY_ADDR));
Trond Myklebust2446ab62012-03-01 17:00:56 -0500712 rcu_read_unlock();
David Howellsf7b422b2006-06-09 09:34:33 -0400713
714 return 0;
715}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400716EXPORT_SYMBOL_GPL(nfs_show_options);
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700717
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400718#if IS_ENABLED(CONFIG_NFS_V4)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300719#ifdef CONFIG_NFS_V4_1
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700720static void show_sessions(struct seq_file *m, struct nfs_server *server)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300721{
722 if (nfs4_has_session(server->nfs_client))
723 seq_printf(m, ",sessions");
724}
725#else
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700726static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
727#endif
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300728#endif
729
730#ifdef CONFIG_NFS_V4_1
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700731static void show_pnfs(struct seq_file *m, struct nfs_server *server)
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300732{
733 seq_printf(m, ",pnfs=");
734 if (server->pnfs_curr_ld)
735 seq_printf(m, "%s", server->pnfs_curr_ld->name);
736 else
737 seq_printf(m, "not configured");
738}
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500739
740static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
741{
Chuck Lever59155542012-05-21 22:44:41 -0400742 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
743 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500744 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
745 "date='%llu,%u'",
746 impl_id->name, impl_id->domain,
747 impl_id->date.seconds, impl_id->date.nseconds);
748 }
749}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700750#else
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400751#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500752static void show_pnfs(struct seq_file *m, struct nfs_server *server)
753{
754}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700755#endif
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500756static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
757{
758}
H Hartley Sweeten45402c382011-09-02 14:39:12 -0700759#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400760
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400761int nfs_show_devname(struct seq_file *m, struct dentry *root)
Al Viroc7f404b2011-03-16 06:59:40 -0400762{
763 char *page = (char *) __get_free_page(GFP_KERNEL);
764 char *devname, *dummy;
765 int err = 0;
766 if (!page)
767 return -ENOMEM;
Al Virod861c632011-12-08 21:32:45 -0500768 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
Al Viroc7f404b2011-03-16 06:59:40 -0400769 if (IS_ERR(devname))
770 err = PTR_ERR(devname);
771 else
772 seq_escape(m, devname, " \t\n\\");
773 free_page((unsigned long)page);
774 return err;
775}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400776EXPORT_SYMBOL_GPL(nfs_show_devname);
Al Viroc7f404b2011-03-16 06:59:40 -0400777
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400778int nfs_show_path(struct seq_file *m, struct dentry *dentry)
Al Viroc7f404b2011-03-16 06:59:40 -0400779{
780 seq_puts(m, "/");
781 return 0;
782}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400783EXPORT_SYMBOL_GPL(nfs_show_path);
Al Viroc7f404b2011-03-16 06:59:40 -0400784
David Howellsf7b422b2006-06-09 09:34:33 -0400785/*
786 * Present statistical information for this VFS mountpoint
787 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400788int nfs_show_stats(struct seq_file *m, struct dentry *root)
David Howellsf7b422b2006-06-09 09:34:33 -0400789{
790 int i, cpu;
Al Viro64132372011-12-08 20:51:13 -0500791 struct nfs_server *nfss = NFS_SB(root->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400792 struct rpc_auth *auth = nfss->client->cl_auth;
793 struct nfs_iostats totals = { };
794
795 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
796
797 /*
798 * Display all mount option settings
799 */
800 seq_printf(m, "\n\topts:\t");
Al Viro64132372011-12-08 20:51:13 -0500801 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
802 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
803 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
804 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
David Howellsf7b422b2006-06-09 09:34:33 -0400805 nfs_show_mount_options(m, nfss, 1);
806
807 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
808
Trond Myklebust7e03b7c2012-03-04 18:12:57 -0500809 show_implementation_id(m, nfss);
Weston Andros Adamson7d2ed9a2012-02-17 15:20:26 -0500810
David Howellsf7b422b2006-06-09 09:34:33 -0400811 seq_printf(m, "\n\tcaps:\t");
812 seq_printf(m, "caps=0x%x", nfss->caps);
Chuck Lever2d767432008-03-14 14:10:08 -0400813 seq_printf(m, ",wtmult=%u", nfss->wtmult);
814 seq_printf(m, ",dtsize=%u", nfss->dtsize);
815 seq_printf(m, ",bsize=%u", nfss->bsize);
816 seq_printf(m, ",namlen=%u", nfss->namelen);
David Howellsf7b422b2006-06-09 09:34:33 -0400817
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400818#if IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust40c553192007-12-14 14:56:07 -0500819 if (nfss->nfs_client->rpc_ops->version == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400820 seq_printf(m, "\n\tnfsv4:\t");
821 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
822 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
823 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
J. Bruce Fieldsae50c0b2011-05-22 19:48:21 +0300824 show_sessions(m, nfss);
825 show_pnfs(m, nfss);
David Howellsf7b422b2006-06-09 09:34:33 -0400826 }
827#endif
828
829 /*
830 * Display security flavor in effect for this mount
831 */
Chuck Lever2d767432008-03-14 14:10:08 -0400832 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400833 if (auth->au_flavor)
Chuck Lever2d767432008-03-14 14:10:08 -0400834 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
David Howellsf7b422b2006-06-09 09:34:33 -0400835
836 /*
837 * Display superblock I/O counters
838 */
839 for_each_possible_cpu(cpu) {
840 struct nfs_iostats *stats;
841
842 preempt_disable();
843 stats = per_cpu_ptr(nfss->io_stats, cpu);
844
845 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
846 totals.events[i] += stats->events[i];
847 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
848 totals.bytes[i] += stats->bytes[i];
David Howells6a510912009-04-03 16:42:43 +0100849#ifdef CONFIG_NFS_FSCACHE
850 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
851 totals.fscache[i] += stats->fscache[i];
852#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400853
854 preempt_enable();
855 }
856
857 seq_printf(m, "\n\tevents:\t");
858 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
859 seq_printf(m, "%lu ", totals.events[i]);
860 seq_printf(m, "\n\tbytes:\t");
861 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
862 seq_printf(m, "%Lu ", totals.bytes[i]);
David Howells6a510912009-04-03 16:42:43 +0100863#ifdef CONFIG_NFS_FSCACHE
864 if (nfss->options & NFS_OPTION_FSCACHE) {
865 seq_printf(m, "\n\tfsc:\t");
866 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
867 seq_printf(m, "%Lu ", totals.bytes[i]);
868 }
869#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400870 seq_printf(m, "\n");
871
872 rpc_print_iostats(m, nfss->client);
873
874 return 0;
875}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400876EXPORT_SYMBOL_GPL(nfs_show_stats);
David Howellsf7b422b2006-06-09 09:34:33 -0400877
878/*
879 * Begin unmount by attempting to remove all automounted mountpoints we added
David Howells54ceac42006-08-22 20:06:13 -0400880 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400881 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -0400882void nfs_umount_begin(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400883{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200884 struct nfs_server *server;
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400885 struct rpc_clnt *rpc;
886
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200887 server = NFS_SB(sb);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400888 /* -EIO all pending I/O */
889 rpc = server->client_acl;
890 if (!IS_ERR(rpc))
891 rpc_killall_tasks(rpc);
892 rpc = server->client;
893 if (!IS_ERR(rpc))
894 rpc_killall_tasks(rpc);
David Howellsf7b422b2006-06-09 09:34:33 -0400895}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400896EXPORT_SYMBOL_GPL(nfs_umount_begin);
David Howellsf7b422b2006-06-09 09:34:33 -0400897
Bryan Schumakerdb833352012-05-10 15:07:38 -0400898static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
Chuck Lever9423a082009-09-23 14:36:38 -0400899{
900 struct nfs_parsed_mount_data *data;
901
902 data = kzalloc(sizeof(*data), GFP_KERNEL);
903 if (data) {
Chuck Lever9423a082009-09-23 14:36:38 -0400904 data->acregmin = NFS_DEF_ACREGMIN;
905 data->acregmax = NFS_DEF_ACREGMAX;
906 data->acdirmin = NFS_DEF_ACDIRMIN;
907 data->acdirmax = NFS_DEF_ACDIRMAX;
Trond Myklebustc5811db2009-10-06 15:40:15 -0400908 data->mount_server.port = NFS_UNSPEC_PORT;
Chuck Lever9423a082009-09-23 14:36:38 -0400909 data->nfs_server.port = NFS_UNSPEC_PORT;
Trond Myklebustc5811db2009-10-06 15:40:15 -0400910 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Lever9423a082009-09-23 14:36:38 -0400911 data->auth_flavors[0] = RPC_AUTH_UNIX;
912 data->auth_flavor_len = 1;
913 data->minorversion = 0;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -0400914 data->need_mount = true;
Trond Myklebust9937347a2012-02-19 08:44:07 +0100915 data->net = current->nsproxy->net_ns;
Jeff Layton8a0d5512011-12-20 06:57:45 -0500916 security_init_mnt_opts(&data->lsm_opts);
Chuck Lever9423a082009-09-23 14:36:38 -0400917 }
918 return data;
919}
920
Jeff Layton8a0d5512011-12-20 06:57:45 -0500921static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
922{
923 if (data) {
924 kfree(data->client_address);
925 kfree(data->mount_server.hostname);
926 kfree(data->nfs_server.export_path);
927 kfree(data->nfs_server.hostname);
928 kfree(data->fscache_uniq);
929 security_free_mnt_opts(&data->lsm_opts);
930 kfree(data);
931 }
932}
933
David Howellsf7b422b2006-06-09 09:34:33 -0400934/*
Chuck Levercdcd7f92007-12-10 14:57:45 -0500935 * Sanity-check a server address provided by the mount command.
936 *
937 * Address family must be initialized, and address must not be
938 * the ANY address for that family.
Chuck Leverfc50d582007-07-01 12:12:46 -0400939 */
940static int nfs_verify_server_address(struct sockaddr *addr)
941{
942 switch (addr->sa_family) {
943 case AF_INET: {
Chuck Levercdcd7f92007-12-10 14:57:45 -0500944 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
Al Viroe6f1ceb2008-03-17 22:44:53 -0700945 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
Chuck Levercdcd7f92007-12-10 14:57:45 -0500946 }
947 case AF_INET6: {
948 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
949 return !ipv6_addr_any(sa);
Chuck Leverfc50d582007-07-01 12:12:46 -0400950 }
951 }
952
Chuck Lever53a0b9c2009-08-09 15:09:36 -0400953 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
Chuck Leverfc50d582007-07-01 12:12:46 -0400954 return 0;
955}
956
Chuck Lever9412b922007-12-10 14:59:21 -0500957/*
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400958 * Select between a default port value and a user-specified port value.
959 * If a zero value is set, then autobind will be used.
960 */
Trond Myklebustf5855fe2009-10-06 15:40:37 -0400961static void nfs_set_port(struct sockaddr *sap, int *port,
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400962 const unsigned short default_port)
963{
Trond Myklebustf5855fe2009-10-06 15:40:37 -0400964 if (*port == NFS_UNSPEC_PORT)
965 *port = default_port;
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400966
Trond Myklebustf5855fe2009-10-06 15:40:37 -0400967 rpc_set_port(sap, *port);
Chuck Lever4cfd74f2009-09-08 19:49:47 -0400968}
969
970/*
Trond Myklebust259875e2008-07-02 14:43:47 -0400971 * Sanity check the NFS transport protocol.
972 *
973 */
974static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
975{
976 switch (mnt->nfs_server.protocol) {
977 case XPRT_TRANSPORT_UDP:
978 case XPRT_TRANSPORT_TCP:
979 case XPRT_TRANSPORT_RDMA:
980 break;
981 default:
982 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
983 }
984}
985
986/*
987 * For text based NFSv2/v3 mounts, the mount protocol transport default
988 * settings should depend upon the specified NFS transport.
989 */
990static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
991{
992 nfs_validate_transport_protocol(mnt);
993
994 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
995 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
996 return;
997 switch (mnt->nfs_server.protocol) {
998 case XPRT_TRANSPORT_UDP:
999 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1000 break;
1001 case XPRT_TRANSPORT_TCP:
1002 case XPRT_TRANSPORT_RDMA:
1003 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1004 }
1005}
1006
1007/*
Chuck Lever01060c82008-06-24 16:33:38 -04001008 * Parse the value of the 'sec=' option.
Chuck Lever01060c82008-06-24 16:33:38 -04001009 */
1010static int nfs_parse_security_flavors(char *value,
1011 struct nfs_parsed_mount_data *mnt)
1012{
1013 substring_t args[MAX_OPT_ARGS];
1014
1015 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1016
1017 switch (match_token(value, nfs_secflavor_tokens, args)) {
1018 case Opt_sec_none:
Chuck Lever01060c82008-06-24 16:33:38 -04001019 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1020 break;
1021 case Opt_sec_sys:
Chuck Lever01060c82008-06-24 16:33:38 -04001022 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1023 break;
1024 case Opt_sec_krb5:
Chuck Lever01060c82008-06-24 16:33:38 -04001025 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1026 break;
1027 case Opt_sec_krb5i:
Chuck Lever01060c82008-06-24 16:33:38 -04001028 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1029 break;
1030 case Opt_sec_krb5p:
Chuck Lever01060c82008-06-24 16:33:38 -04001031 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1032 break;
1033 case Opt_sec_lkey:
Chuck Lever01060c82008-06-24 16:33:38 -04001034 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1035 break;
1036 case Opt_sec_lkeyi:
Chuck Lever01060c82008-06-24 16:33:38 -04001037 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1038 break;
1039 case Opt_sec_lkeyp:
Chuck Lever01060c82008-06-24 16:33:38 -04001040 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1041 break;
1042 case Opt_sec_spkm:
Chuck Lever01060c82008-06-24 16:33:38 -04001043 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1044 break;
1045 case Opt_sec_spkmi:
Chuck Lever01060c82008-06-24 16:33:38 -04001046 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1047 break;
1048 case Opt_sec_spkmp:
Chuck Lever01060c82008-06-24 16:33:38 -04001049 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1050 break;
1051 default:
1052 return 0;
1053 }
1054
Bryan Schumaker9b7160c2011-04-13 14:31:30 -04001055 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
Chuck Lever059f90b2009-08-09 15:09:31 -04001056 mnt->auth_flavor_len = 1;
Chuck Lever01060c82008-06-24 16:33:38 -04001057 return 1;
1058}
1059
Trond Myklebust0d71b052012-03-02 13:59:49 -05001060static int nfs_parse_version_string(char *string,
1061 struct nfs_parsed_mount_data *mnt,
1062 substring_t *args)
1063{
1064 mnt->flags &= ~NFS_MOUNT_VER3;
1065 switch (match_token(string, nfs_vers_tokens, args)) {
1066 case Opt_vers_2:
1067 mnt->version = 2;
1068 break;
1069 case Opt_vers_3:
1070 mnt->flags |= NFS_MOUNT_VER3;
1071 mnt->version = 3;
1072 break;
1073 case Opt_vers_4:
1074 /* Backward compatibility option. In future,
1075 * the mount program should always supply
1076 * a NFSv4 minor version number.
1077 */
1078 mnt->version = 4;
1079 break;
1080 case Opt_vers_4_0:
1081 mnt->version = 4;
1082 mnt->minorversion = 0;
1083 break;
1084 case Opt_vers_4_1:
1085 mnt->version = 4;
1086 mnt->minorversion = 1;
1087 break;
1088 default:
1089 return 0;
1090 }
1091 return 1;
1092}
1093
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001094static int nfs_get_option_str(substring_t args[], char **option)
1095{
1096 kfree(*option);
1097 *option = match_strdup(args);
1098 return !option;
1099}
1100
1101static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1102{
1103 int rc;
1104 char *string;
1105
1106 string = match_strdup(args);
1107 if (string == NULL)
1108 return -ENOMEM;
1109 rc = strict_strtoul(string, 10, option);
1110 kfree(string);
1111
1112 return rc;
1113}
1114
Chuck Lever01060c82008-06-24 16:33:38 -04001115/*
Chuck Leverbf0fd762007-07-01 12:13:44 -04001116 * Error-check and convert a string of mount options from user space into
Chuck Leverf45663c2008-06-24 19:28:02 -04001117 * a data structure. The whole mount string is processed; bad options are
1118 * skipped as they are encountered. If there were no errors, return 1;
1119 * otherwise return 0 (zero).
Chuck Leverbf0fd762007-07-01 12:13:44 -04001120 */
1121static int nfs_parse_mount_options(char *raw,
1122 struct nfs_parsed_mount_data *mnt)
1123{
Eric Parisf9c3a382008-03-05 14:20:18 -05001124 char *p, *string, *secdata;
Chuck Leverd23c45f2009-06-17 18:02:13 -07001125 int rc, sloppy = 0, invalid_option = 0;
Jeff Laytonee671b02009-12-03 15:58:56 -05001126 unsigned short protofamily = AF_UNSPEC;
1127 unsigned short mountfamily = AF_UNSPEC;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001128
1129 if (!raw) {
1130 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1131 return 1;
1132 }
1133 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1134
Eric Parisf9c3a382008-03-05 14:20:18 -05001135 secdata = alloc_secdata();
1136 if (!secdata)
1137 goto out_nomem;
1138
1139 rc = security_sb_copy_data(raw, secdata);
1140 if (rc)
1141 goto out_security_failure;
1142
1143 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1144 if (rc)
1145 goto out_security_failure;
1146
1147 free_secdata(secdata);
1148
Chuck Leverbf0fd762007-07-01 12:13:44 -04001149 while ((p = strsep(&raw, ",")) != NULL) {
1150 substring_t args[MAX_OPT_ARGS];
Chuck Levera5a16ba2009-06-17 18:02:14 -07001151 unsigned long option;
1152 int token;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001153
1154 if (!*p)
1155 continue;
1156
1157 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1158
1159 token = match_token(p, nfs_mount_option_tokens, args);
1160 switch (token) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001161
1162 /*
1163 * boolean options: foo/nofoo
1164 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001165 case Opt_soft:
1166 mnt->flags |= NFS_MOUNT_SOFT;
1167 break;
1168 case Opt_hard:
1169 mnt->flags &= ~NFS_MOUNT_SOFT;
1170 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001171 case Opt_posix:
1172 mnt->flags |= NFS_MOUNT_POSIX;
1173 break;
1174 case Opt_noposix:
1175 mnt->flags &= ~NFS_MOUNT_POSIX;
1176 break;
1177 case Opt_cto:
1178 mnt->flags &= ~NFS_MOUNT_NOCTO;
1179 break;
1180 case Opt_nocto:
1181 mnt->flags |= NFS_MOUNT_NOCTO;
1182 break;
1183 case Opt_ac:
1184 mnt->flags &= ~NFS_MOUNT_NOAC;
1185 break;
1186 case Opt_noac:
1187 mnt->flags |= NFS_MOUNT_NOAC;
1188 break;
1189 case Opt_lock:
1190 mnt->flags &= ~NFS_MOUNT_NONLM;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001191 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1192 NFS_MOUNT_LOCAL_FCNTL);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001193 break;
1194 case Opt_nolock:
1195 mnt->flags |= NFS_MOUNT_NONLM;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001196 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1197 NFS_MOUNT_LOCAL_FCNTL);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001198 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001199 case Opt_udp:
1200 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001201 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001202 break;
1203 case Opt_tcp:
1204 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001205 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001206 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001207 case Opt_rdma:
1208 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1209 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001210 xprt_load_transport(p);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001211 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001212 case Opt_acl:
1213 mnt->flags &= ~NFS_MOUNT_NOACL;
1214 break;
1215 case Opt_noacl:
1216 mnt->flags |= NFS_MOUNT_NOACL;
1217 break;
1218 case Opt_rdirplus:
1219 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1220 break;
1221 case Opt_nordirplus:
1222 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1223 break;
Trond Myklebust75180df2007-05-16 16:53:28 -04001224 case Opt_sharecache:
1225 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1226 break;
1227 case Opt_nosharecache:
1228 mnt->flags |= NFS_MOUNT_UNSHARED;
1229 break;
Chuck Leverd7403512008-12-23 15:21:37 -05001230 case Opt_resvport:
1231 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1232 break;
1233 case Opt_noresvport:
1234 mnt->flags |= NFS_MOUNT_NORESVPORT;
1235 break;
David Howellsb797cac2009-04-03 16:42:48 +01001236 case Opt_fscache:
1237 mnt->options |= NFS_OPTION_FSCACHE;
1238 kfree(mnt->fscache_uniq);
1239 mnt->fscache_uniq = NULL;
1240 break;
1241 case Opt_nofscache:
1242 mnt->options &= ~NFS_OPTION_FSCACHE;
1243 kfree(mnt->fscache_uniq);
1244 mnt->fscache_uniq = NULL;
1245 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001246
Chuck Leverf45663c2008-06-24 19:28:02 -04001247 /*
1248 * options that take numeric values
1249 */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001250 case Opt_port:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001251 if (nfs_get_option_ul(args, &option) ||
1252 option > USHRT_MAX)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001253 goto out_invalid_value;
1254 mnt->nfs_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001255 break;
1256 case Opt_rsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001257 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001258 goto out_invalid_value;
1259 mnt->rsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001260 break;
1261 case Opt_wsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001262 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001263 goto out_invalid_value;
1264 mnt->wsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001265 break;
1266 case Opt_bsize:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001267 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001268 goto out_invalid_value;
1269 mnt->bsize = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001270 break;
1271 case Opt_timeo:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001272 if (nfs_get_option_ul(args, &option) || option == 0)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001273 goto out_invalid_value;
1274 mnt->timeo = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001275 break;
1276 case Opt_retrans:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001277 if (nfs_get_option_ul(args, &option) || option == 0)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001278 goto out_invalid_value;
1279 mnt->retrans = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001280 break;
1281 case Opt_acregmin:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001282 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001283 goto out_invalid_value;
1284 mnt->acregmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001285 break;
1286 case Opt_acregmax:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001287 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001288 goto out_invalid_value;
1289 mnt->acregmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001290 break;
1291 case Opt_acdirmin:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001292 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001293 goto out_invalid_value;
1294 mnt->acdirmin = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001295 break;
1296 case Opt_acdirmax:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001297 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001298 goto out_invalid_value;
1299 mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001300 break;
1301 case Opt_actimeo:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001302 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001303 goto out_invalid_value;
1304 mnt->acregmin = mnt->acregmax =
1305 mnt->acdirmin = mnt->acdirmax = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001306 break;
1307 case Opt_namelen:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001308 if (nfs_get_option_ul(args, &option))
Chuck Leverd23c45f2009-06-17 18:02:13 -07001309 goto out_invalid_value;
1310 mnt->namlen = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001311 break;
1312 case Opt_mountport:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001313 if (nfs_get_option_ul(args, &option) ||
1314 option > USHRT_MAX)
Chuck Leverd23c45f2009-06-17 18:02:13 -07001315 goto out_invalid_value;
1316 mnt->mount_server.port = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001317 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001318 case Opt_mountvers:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001319 if (nfs_get_option_ul(args, &option) ||
Chuck Leverf45663c2008-06-24 19:28:02 -04001320 option < NFS_MNT_VERSION ||
Chuck Leverd23c45f2009-06-17 18:02:13 -07001321 option > NFS_MNT3_VERSION)
1322 goto out_invalid_value;
1323 mnt->mount_server.version = option;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001324 break;
Mike Sager3fd5be92009-04-01 09:21:48 -04001325 case Opt_minorversion:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001326 if (nfs_get_option_ul(args, &option))
Chuck Leverf3f4f4e2009-08-09 15:09:29 -04001327 goto out_invalid_value;
1328 if (option > NFS4_MAX_MINOR_VERSION)
1329 goto out_invalid_value;
1330 mnt->minorversion = option;
Mike Sager3fd5be92009-04-01 09:21:48 -04001331 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001332
Chuck Leverf45663c2008-06-24 19:28:02 -04001333 /*
1334 * options that take text values
1335 */
Trond Myklebust0d71b052012-03-02 13:59:49 -05001336 case Opt_nfsvers:
1337 string = match_strdup(args);
1338 if (string == NULL)
1339 goto out_nomem;
1340 rc = nfs_parse_version_string(string, mnt, args);
1341 kfree(string);
1342 if (!rc)
1343 goto out_invalid_value;
1344 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001345 case Opt_sec:
1346 string = match_strdup(args);
1347 if (string == NULL)
1348 goto out_nomem;
Chuck Lever01060c82008-06-24 16:33:38 -04001349 rc = nfs_parse_security_flavors(string, mnt);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001350 kfree(string);
Chuck Leverf45663c2008-06-24 19:28:02 -04001351 if (!rc) {
Chuck Leverf45663c2008-06-24 19:28:02 -04001352 dfprintk(MOUNT, "NFS: unrecognized "
1353 "security flavor\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001354 return 0;
Chuck Leverf45663c2008-06-24 19:28:02 -04001355 }
Chuck Leverbf0fd762007-07-01 12:13:44 -04001356 break;
1357 case Opt_proto:
1358 string = match_strdup(args);
1359 if (string == NULL)
1360 goto out_nomem;
1361 token = match_token(string,
1362 nfs_xprt_protocol_tokens, args);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001363
Jeff Laytonee671b02009-12-03 15:58:56 -05001364 protofamily = AF_INET;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001365 switch (token) {
Jeff Laytonee671b02009-12-03 15:58:56 -05001366 case Opt_xprt_udp6:
1367 protofamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001368 case Opt_xprt_udp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001369 mnt->flags &= ~NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001370 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001371 break;
Jeff Laytonee671b02009-12-03 15:58:56 -05001372 case Opt_xprt_tcp6:
1373 protofamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001374 case Opt_xprt_tcp:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001375 mnt->flags |= NFS_MOUNT_TCP;
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001376 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001377 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001378 case Opt_xprt_rdma:
1379 /* vector side protocols to TCP */
1380 mnt->flags |= NFS_MOUNT_TCP;
1381 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
Tom Talpeya67d18f2009-03-11 14:37:56 -04001382 xprt_load_transport(string);
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001383 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001384 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "transport protocol\n");
Yinghai Lu4223a4a2009-10-20 14:13:46 +09001387 kfree(string);
Chuck Leverd23c45f2009-06-17 18:02:13 -07001388 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001389 }
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001390 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001391 break;
1392 case Opt_mountproto:
1393 string = match_strdup(args);
1394 if (string == NULL)
1395 goto out_nomem;
1396 token = match_token(string,
1397 nfs_xprt_protocol_tokens, args);
Trond Myklebustd508afb2009-04-06 16:41:35 -07001398 kfree(string);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001399
Jeff Laytonee671b02009-12-03 15:58:56 -05001400 mountfamily = AF_INET;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001401 switch (token) {
Jeff Laytonee671b02009-12-03 15:58:56 -05001402 case Opt_xprt_udp6:
1403 mountfamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001404 case Opt_xprt_udp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001405 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001406 break;
Jeff Laytonee671b02009-12-03 15:58:56 -05001407 case Opt_xprt_tcp6:
1408 mountfamily = AF_INET6;
Chuck Leverfdb66ff2007-08-29 17:58:57 -04001409 case Opt_xprt_tcp:
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001410 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001411 break;
\"Talpey, Thomas\2cf7ff72007-09-10 13:49:41 -04001412 case Opt_xprt_rdma: /* not used for side protocols */
Chuck Leverbf0fd762007-07-01 12:13:44 -04001413 default:
Chuck Leverf45663c2008-06-24 19:28:02 -04001414 dfprintk(MOUNT, "NFS: unrecognized "
1415 "transport protocol\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001416 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001417 }
1418 break;
1419 case Opt_addr:
1420 string = match_strdup(args);
1421 if (string == NULL)
1422 goto out_nomem;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001423 mnt->nfs_server.addrlen =
Stanislav Kinsburskyb48e1272012-01-26 15:11:57 +04001424 rpc_pton(mnt->net, string, strlen(string),
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001425 (struct sockaddr *)
1426 &mnt->nfs_server.address,
1427 sizeof(mnt->nfs_server.address));
Chuck Leverbf0fd762007-07-01 12:13:44 -04001428 kfree(string);
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001429 if (mnt->nfs_server.addrlen == 0)
1430 goto out_invalid_address;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001431 break;
1432 case Opt_clientaddr:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001433 if (nfs_get_option_str(args, &mnt->client_address))
Chuck Leverbf0fd762007-07-01 12:13:44 -04001434 goto out_nomem;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001435 break;
Chuck Lever33832032007-12-10 14:59:13 -05001436 case Opt_mounthost:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001437 if (nfs_get_option_str(args,
1438 &mnt->mount_server.hostname))
Chuck Lever33832032007-12-10 14:59:13 -05001439 goto out_nomem;
Chuck Lever33832032007-12-10 14:59:13 -05001440 break;
Chuck Lever0ac83772007-09-11 18:01:04 -04001441 case Opt_mountaddr:
Chuck Leverbf0fd762007-07-01 12:13:44 -04001442 string = match_strdup(args);
1443 if (string == NULL)
1444 goto out_nomem;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001445 mnt->mount_server.addrlen =
Stanislav Kinsburskyb48e1272012-01-26 15:11:57 +04001446 rpc_pton(mnt->net, string, strlen(string),
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001447 (struct sockaddr *)
1448 &mnt->mount_server.address,
1449 sizeof(mnt->mount_server.address));
Chuck Leverbf0fd762007-07-01 12:13:44 -04001450 kfree(string);
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001451 if (mnt->mount_server.addrlen == 0)
1452 goto out_invalid_address;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001453 break;
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001454 case Opt_lookupcache:
1455 string = match_strdup(args);
1456 if (string == NULL)
1457 goto out_nomem;
1458 token = match_token(string,
1459 nfs_lookupcache_tokens, args);
1460 kfree(string);
1461 switch (token) {
1462 case Opt_lookupcache_all:
1463 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1464 break;
1465 case Opt_lookupcache_positive:
1466 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1467 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1468 break;
1469 case Opt_lookupcache_none:
1470 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1471 break;
1472 default:
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001473 dfprintk(MOUNT, "NFS: invalid "
1474 "lookupcache argument\n");
Chuck Leverd23c45f2009-06-17 18:02:13 -07001475 return 0;
Trond Myklebust7973c1f2008-07-15 17:58:14 -04001476 };
1477 break;
Chuck Levera6d5ff62010-05-07 13:33:58 -04001478 case Opt_fscache_uniq:
Rob Landleyc5cb09b2011-03-09 16:02:37 -06001479 if (nfs_get_option_str(args, &mnt->fscache_uniq))
Chuck Levera6d5ff62010-05-07 13:33:58 -04001480 goto out_nomem;
Chuck Levera6d5ff62010-05-07 13:33:58 -04001481 mnt->options |= NFS_OPTION_FSCACHE;
1482 break;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001483 case Opt_local_lock:
1484 string = match_strdup(args);
1485 if (string == NULL)
1486 goto out_nomem;
1487 token = match_token(string, nfs_local_lock_tokens,
1488 args);
1489 kfree(string);
1490 switch (token) {
1491 case Opt_local_lock_all:
1492 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1493 NFS_MOUNT_LOCAL_FCNTL);
1494 break;
1495 case Opt_local_lock_flock:
1496 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1497 break;
1498 case Opt_local_lock_posix:
1499 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1500 break;
1501 case Opt_local_lock_none:
1502 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1503 NFS_MOUNT_LOCAL_FCNTL);
1504 break;
1505 default:
1506 dfprintk(MOUNT, "NFS: invalid "
1507 "local_lock argument\n");
1508 return 0;
1509 };
1510 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001511
Chuck Leverf45663c2008-06-24 19:28:02 -04001512 /*
1513 * Special options
1514 */
1515 case Opt_sloppy:
1516 sloppy = 1;
1517 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1518 break;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001519 case Opt_userspace:
1520 case Opt_deprecated:
Chuck Leverd33e4df2008-06-12 12:37:41 -04001521 dfprintk(MOUNT, "NFS: ignoring mount option "
1522 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001523 break;
1524
1525 default:
Chuck Leverd23c45f2009-06-17 18:02:13 -07001526 invalid_option = 1;
Chuck Leverf45663c2008-06-24 19:28:02 -04001527 dfprintk(MOUNT, "NFS: unrecognized mount option "
1528 "'%s'\n", p);
Chuck Leverbf0fd762007-07-01 12:13:44 -04001529 }
1530 }
1531
Chuck Leverd23c45f2009-06-17 18:02:13 -07001532 if (!sloppy && invalid_option)
1533 return 0;
1534
Weston Andros Adamson571b7552012-02-01 14:06:41 -05001535 if (mnt->minorversion && mnt->version != 4)
1536 goto out_minorversion_mismatch;
1537
Jeff Laytonee671b02009-12-03 15:58:56 -05001538 /*
1539 * verify that any proto=/mountproto= options match the address
1540 * familiies in the addr=/mountaddr= options.
1541 */
1542 if (protofamily != AF_UNSPEC &&
1543 protofamily != mnt->nfs_server.address.ss_family)
1544 goto out_proto_mismatch;
1545
1546 if (mountfamily != AF_UNSPEC) {
1547 if (mnt->mount_server.addrlen) {
1548 if (mountfamily != mnt->mount_server.address.ss_family)
1549 goto out_mountproto_mismatch;
1550 } else {
1551 if (mountfamily != mnt->nfs_server.address.ss_family)
1552 goto out_mountproto_mismatch;
1553 }
1554 }
1555
Chuck Leverbf0fd762007-07-01 12:13:44 -04001556 return 1;
1557
Jeff Laytonee671b02009-12-03 15:58:56 -05001558out_mountproto_mismatch:
1559 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1560 "option\n");
1561 return 0;
1562out_proto_mismatch:
1563 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1564 return 0;
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001565out_invalid_address:
1566 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1567 return 0;
Chuck Leverd23c45f2009-06-17 18:02:13 -07001568out_invalid_value:
Chuck Lever53a0b9c2009-08-09 15:09:36 -04001569 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
Chuck Leverd23c45f2009-06-17 18:02:13 -07001570 return 0;
Weston Andros Adamson571b7552012-02-01 14:06:41 -05001571out_minorversion_mismatch:
1572 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1573 "minorversion=%u\n", mnt->version, mnt->minorversion);
1574 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001575out_nomem:
1576 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1577 return 0;
Eric Parisf9c3a382008-03-05 14:20:18 -05001578out_security_failure:
1579 free_secdata(secdata);
1580 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1581 return 0;
Chuck Leverbf0fd762007-07-01 12:13:44 -04001582}
1583
1584/*
Chuck Leverec88f282009-08-09 15:09:32 -04001585 * Match the requested auth flavors with the list returned by
1586 * the server. Returns zero and sets the mount's authentication
1587 * flavor on success; returns -EACCES if server does not support
1588 * the requested flavor.
1589 */
1590static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1591 struct nfs_mount_request *request)
1592{
1593 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1594
1595 /*
Chuck Lever5eecfde2009-08-21 17:50:30 -04001596 * Certain releases of Linux's mountd return an empty
1597 * flavor list. To prevent behavioral regression with
1598 * these servers (ie. rejecting mounts that used to
1599 * succeed), revert to pre-2.6.32 behavior (no checking)
1600 * if the returned flavor list is empty.
1601 */
1602 if (server_authlist_len == 0)
1603 return 0;
1604
1605 /*
Chuck Leverec88f282009-08-09 15:09:32 -04001606 * We avoid sophisticated negotiating here, as there are
1607 * plenty of cases where we can get it wrong, providing
1608 * either too little or too much security.
1609 *
1610 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1611 * flavor listed first. However, some servers list
1612 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1613 * preferred default, in args->auth_flavors[0] if user
1614 * didn't specify sec= mount option.
1615 */
1616 for (i = 0; i < args->auth_flavor_len; i++)
1617 for (j = 0; j < server_authlist_len; j++)
1618 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1619 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1620 request->auth_flavs[j]);
1621 args->auth_flavors[0] = request->auth_flavs[j];
1622 return 0;
1623 }
1624
1625 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1626 nfs_umount(request);
1627 return -EACCES;
1628}
1629
1630/*
Chuck Lever0076d7b2007-07-01 12:13:49 -04001631 * Use the remote server's MOUNT service to request the NFS file handle
1632 * corresponding to the provided path.
1633 */
Bryan Schumaker486aa692012-05-10 15:07:39 -04001634static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1635 struct nfs_fh *root_fh)
Chuck Lever0076d7b2007-07-01 12:13:49 -04001636{
Chuck Leverec88f282009-08-09 15:09:32 -04001637 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1638 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
Chuck Leverc5d120f2008-12-23 15:21:35 -05001639 struct nfs_mount_request request = {
1640 .sap = (struct sockaddr *)
1641 &args->mount_server.address,
1642 .dirpath = args->nfs_server.export_path,
1643 .protocol = args->mount_server.protocol,
1644 .fh = root_fh,
Chuck Lever50a737f2008-12-23 15:21:37 -05001645 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
Chuck Leverec88f282009-08-09 15:09:32 -04001646 .auth_flav_len = &server_authlist_len,
1647 .auth_flavs = server_authlist,
Stanislav Kinsbursky6d59b8d2012-01-10 16:12:54 +04001648 .net = args->net,
Chuck Leverc5d120f2008-12-23 15:21:35 -05001649 };
Chuck Lever4c568012007-12-10 14:59:28 -05001650 int status;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001651
1652 if (args->mount_server.version == 0) {
Trond Myklebust8a6e5de2009-09-23 14:36:37 -04001653 switch (args->version) {
1654 default:
1655 args->mount_server.version = NFS_MNT3_VERSION;
1656 break;
1657 case 2:
1658 args->mount_server.version = NFS_MNT_VERSION;
1659 }
Chuck Lever0076d7b2007-07-01 12:13:49 -04001660 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001661 request.version = args->mount_server.version;
Chuck Lever0076d7b2007-07-01 12:13:49 -04001662
Chuck Lever33832032007-12-10 14:59:13 -05001663 if (args->mount_server.hostname)
Chuck Leverc5d120f2008-12-23 15:21:35 -05001664 request.hostname = args->mount_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001665 else
Chuck Leverc5d120f2008-12-23 15:21:35 -05001666 request.hostname = args->nfs_server.hostname;
Chuck Lever33832032007-12-10 14:59:13 -05001667
Chuck Lever0076d7b2007-07-01 12:13:49 -04001668 /*
1669 * Construct the mount server's address.
1670 */
Chuck Lever4c568012007-12-10 14:59:28 -05001671 if (args->mount_server.address.ss_family == AF_UNSPEC) {
Chuck Leverc5d120f2008-12-23 15:21:35 -05001672 memcpy(request.sap, &args->nfs_server.address,
Chuck Lever4c568012007-12-10 14:59:28 -05001673 args->nfs_server.addrlen);
1674 args->mount_server.addrlen = args->nfs_server.addrlen;
1675 }
Chuck Leverc5d120f2008-12-23 15:21:35 -05001676 request.salen = args->mount_server.addrlen;
Trond Myklebustf5855fe2009-10-06 15:40:37 -04001677 nfs_set_port(request.sap, &args->mount_server.port, 0);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001678
1679 /*
1680 * Now ask the mount server to map our export path
1681 * to a file handle.
1682 */
Chuck Leverc5d120f2008-12-23 15:21:35 -05001683 status = nfs_mount(&request);
Chuck Leverec88f282009-08-09 15:09:32 -04001684 if (status != 0) {
1685 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1686 request.hostname, status);
1687 return status;
1688 }
Chuck Lever0076d7b2007-07-01 12:13:49 -04001689
Chuck Leverec88f282009-08-09 15:09:32 -04001690 /*
1691 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1692 */
1693 if (args->mount_server.version != NFS_MNT3_VERSION)
1694 return 0;
1695 return nfs_walk_authlist(args, &request);
Chuck Lever0076d7b2007-07-01 12:13:49 -04001696}
1697
Bryan Schumakerff9099f22012-07-30 16:05:18 -04001698struct dentry *nfs_try_mount(int flags, const char *dev_name,
1699 struct nfs_mount_info *mount_info,
1700 struct nfs_subversion *nfs_mod)
Bryan Schumaker486aa692012-05-10 15:07:39 -04001701{
1702 int status;
1703 struct nfs_server *server;
1704
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001705 if (mount_info->parsed->need_mount) {
Bryan Schumaker87c70832012-05-10 15:07:43 -04001706 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001707 if (status)
1708 return ERR_PTR(status);
1709 }
Bryan Schumaker486aa692012-05-10 15:07:39 -04001710
1711 /* Get a volume representation */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001712 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001713 if (IS_ERR(server))
1714 return ERR_CAST(server);
1715
Bryan Schumakerab7017a2012-07-30 16:05:16 -04001716 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001717}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001718EXPORT_SYMBOL_GPL(nfs_try_mount);
Bryan Schumaker486aa692012-05-10 15:07:39 -04001719
Rob Landleyc12bace2011-03-09 15:54:13 -06001720/*
1721 * Split "dev_name" into "hostname:export_path".
1722 *
1723 * The leftmost colon demarks the split between the server's hostname
1724 * and the export path. If the hostname starts with a left square
1725 * bracket, then it may contain colons.
1726 *
1727 * Note: caller frees hostname and export path, even on error.
1728 */
1729static int nfs_parse_devname(const char *dev_name,
1730 char **hostname, size_t maxnamlen,
1731 char **export_path, size_t maxpathlen)
Chuck Leverdc045892008-06-23 12:36:37 -04001732{
1733 size_t len;
Rob Landleyc12bace2011-03-09 15:54:13 -06001734 char *end;
Chuck Leverdc045892008-06-23 12:36:37 -04001735
Rob Landleyc12bace2011-03-09 15:54:13 -06001736 /* Is the host name protected with square brakcets? */
1737 if (*dev_name == '[') {
1738 end = strchr(++dev_name, ']');
1739 if (end == NULL || end[1] != ':')
1740 goto out_bad_devname;
Chuck Leverdc045892008-06-23 12:36:37 -04001741
Rob Landleyc12bace2011-03-09 15:54:13 -06001742 len = end - dev_name;
1743 end++;
1744 } else {
1745 char *comma;
1746
1747 end = strchr(dev_name, ':');
1748 if (end == NULL)
1749 goto out_bad_devname;
1750 len = end - dev_name;
1751
1752 /* kill possible hostname list: not supported */
1753 comma = strchr(dev_name, ',');
1754 if (comma != NULL && comma < end)
1755 *comma = 0;
1756 }
1757
Chuck Leverdc045892008-06-23 12:36:37 -04001758 if (len > maxnamlen)
1759 goto out_hostname;
1760
1761 /* N.B. caller will free nfs_server.hostname in all cases */
1762 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
Rob Landleyc12bace2011-03-09 15:54:13 -06001763 if (*hostname == NULL)
Chuck Leverdc045892008-06-23 12:36:37 -04001764 goto out_nomem;
Rob Landleyc12bace2011-03-09 15:54:13 -06001765 len = strlen(++end);
Chuck Leverdc045892008-06-23 12:36:37 -04001766 if (len > maxpathlen)
1767 goto out_path;
Rob Landleyc12bace2011-03-09 15:54:13 -06001768 *export_path = kstrndup(end, len, GFP_KERNEL);
Chuck Leverdc045892008-06-23 12:36:37 -04001769 if (!*export_path)
1770 goto out_nomem;
1771
1772 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1773 return 0;
1774
1775out_bad_devname:
1776 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1777 return -EINVAL;
1778
1779out_nomem:
1780 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1781 return -ENOMEM;
1782
1783out_hostname:
1784 dfprintk(MOUNT, "NFS: server hostname too long\n");
1785 return -ENAMETOOLONG;
1786
1787out_path:
1788 dfprintk(MOUNT, "NFS: export pathname too long\n");
1789 return -ENAMETOOLONG;
1790}
1791
1792/*
David Howells54ceac42006-08-22 20:06:13 -04001793 * Validate the NFS2/NFS3 mount data
1794 * - fills in the mount root filehandle
Chuck Lever136d5582007-07-01 12:13:54 -04001795 *
1796 * For option strings, user space handles the following behaviors:
1797 *
1798 * + DNS: mapping server host name to IP address ("addr=" option)
1799 *
1800 * + failure mode: how to behave if a mount request can't be handled
1801 * immediately ("fg/bg" option)
1802 *
1803 * + retry: how often to retry a mount request ("retry=" option)
1804 *
1805 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1806 * mountproto=tcp after mountproto=udp, and so on
David Howellsf7b422b2006-06-09 09:34:33 -04001807 */
Bryan Schumakerd72c7272012-05-10 15:07:41 -04001808static int nfs23_validate_mount_data(void *options,
1809 struct nfs_parsed_mount_data *args,
1810 struct nfs_fh *mntfh,
1811 const char *dev_name)
David Howellsf7b422b2006-06-09 09:34:33 -04001812{
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001813 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001814 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
Chuck Lever136d5582007-07-01 12:13:54 -04001815
Chuck Lever5df36e72007-07-01 12:12:56 -04001816 if (data == NULL)
1817 goto out_no_data;
David Howells54ceac42006-08-22 20:06:13 -04001818
Bryan Schumakerc5afc8d2012-06-08 11:32:56 -04001819 args->version = NFS_DEFAULT_VERSION;
David Howellsf7b422b2006-06-09 09:34:33 -04001820 switch (data->version) {
Chuck Lever5df36e72007-07-01 12:12:56 -04001821 case 1:
1822 data->namlen = 0;
1823 case 2:
1824 data->bsize = 0;
1825 case 3:
1826 if (data->flags & NFS_MOUNT_VER3)
1827 goto out_no_v3;
1828 data->root.size = NFS2_FHSIZE;
1829 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1830 case 4:
1831 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1832 goto out_no_sec;
1833 case 5:
1834 memset(data->context, 0, sizeof(data->context));
1835 case 6:
Trond Myklebustb7e24452008-06-19 15:21:11 -04001836 if (data->flags & NFS_MOUNT_VER3) {
1837 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1838 goto out_invalid_fh;
Chuck Lever5df36e72007-07-01 12:12:56 -04001839 mntfh->size = data->root.size;
Chuck Lever764302c2009-09-08 19:50:03 -04001840 args->version = 3;
1841 } else {
Chuck Lever5df36e72007-07-01 12:12:56 -04001842 mntfh->size = NFS2_FHSIZE;
Chuck Lever764302c2009-09-08 19:50:03 -04001843 args->version = 2;
1844 }
Chuck Lever5df36e72007-07-01 12:12:56 -04001845
Chuck Lever5df36e72007-07-01 12:12:56 -04001846
1847 memcpy(mntfh->data, data->root.data, mntfh->size);
1848 if (mntfh->size < sizeof(mntfh->data))
1849 memset(mntfh->data + mntfh->size, 0,
1850 sizeof(mntfh->data) - mntfh->size);
Chuck Lever6e88e062007-09-24 15:39:50 -04001851
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001852 /*
1853 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1854 * can deal with.
1855 */
Trond Myklebustff3525a2008-08-15 16:59:14 -04001856 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
Bryan Schumakerd5eff1a2010-08-03 13:04:00 -04001857 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001858 args->rsize = data->rsize;
1859 args->wsize = data->wsize;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001860 args->timeo = data->timeo;
1861 args->retrans = data->retrans;
1862 args->acregmin = data->acregmin;
1863 args->acregmax = data->acregmax;
1864 args->acdirmin = data->acdirmin;
1865 args->acdirmax = data->acdirmax;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001866 args->need_mount = false;
Chuck Lever4c568012007-12-10 14:59:28 -05001867
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001868 memcpy(sap, &data->addr, sizeof(data->addr));
Chuck Lever4c568012007-12-10 14:59:28 -05001869 args->nfs_server.addrlen = sizeof(data->addr);
Trond Myklebust872ece82012-09-04 11:05:07 -04001870 args->nfs_server.port = ntohs(data->addr.sin_port);
Chuck Lever4cfd74f2009-09-08 19:49:47 -04001871 if (!nfs_verify_server_address(sap))
Chuck Lever4c568012007-12-10 14:59:28 -05001872 goto out_no_address;
1873
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001874 if (!(data->flags & NFS_MOUNT_TCP))
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -04001875 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
\"Talpey, Thomas\2283f8d2007-09-10 13:43:56 -04001876 /* N.B. caller will free nfs_server.hostname in all cases */
1877 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1878 args->namlen = data->namlen;
1879 args->bsize = data->bsize;
Chuck Leverdd07c942008-06-24 16:33:46 -04001880
1881 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1882 args->auth_flavors[0] = data->pseudoflavor;
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001883 if (!args->nfs_server.hostname)
1884 goto out_nomem;
Eric Parisf9c3a382008-03-05 14:20:18 -05001885
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04001886 if (!(data->flags & NFS_MOUNT_NONLM))
1887 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1888 NFS_MOUNT_LOCAL_FCNTL);
1889 else
1890 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1891 NFS_MOUNT_LOCAL_FCNTL);
Eric Parisf9c3a382008-03-05 14:20:18 -05001892 /*
1893 * The legacy version 6 binary mount data from userspace has a
1894 * field used only to transport selinux information into the
1895 * the kernel. To continue to support that functionality we
1896 * have a touch of selinux knowledge here in the NFS code. The
1897 * userspace code converted context=blah to just blah so we are
1898 * converting back to the full string selinux understands.
1899 */
1900 if (data->context[0]){
1901#ifdef CONFIG_SECURITY_SELINUX
1902 int rc;
1903 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1904 if (!opts_str)
1905 return -ENOMEM;
1906 strcpy(opts_str, "context=");
1907 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1908 strcat(opts_str, &data->context[0]);
1909 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1910 kfree(opts_str);
1911 if (rc)
1912 return rc;
1913#else
1914 return -EINVAL;
1915#endif
1916 }
1917
Chuck Lever5df36e72007-07-01 12:12:56 -04001918 break;
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001919 default:
1920 return NFS_TEXT_DATA;
David Howellsf7b422b2006-06-09 09:34:33 -04001921 }
David Howells54ceac42006-08-22 20:06:13 -04001922
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04001923#if !IS_ENABLED(CONFIG_NFS_V3)
Trond Myklebust8a6e5de2009-09-23 14:36:37 -04001924 if (args->version == 3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001925 goto out_v3_not_compiled;
1926#endif /* !CONFIG_NFS_V3 */
David Howells54ceac42006-08-22 20:06:13 -04001927
David Howells54ceac42006-08-22 20:06:13 -04001928 return 0;
Chuck Lever5df36e72007-07-01 12:12:56 -04001929
1930out_no_data:
1931 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1932 return -EINVAL;
1933
1934out_no_v3:
1935 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1936 data->version);
1937 return -EINVAL;
1938
1939out_no_sec:
1940 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1941 return -EINVAL;
1942
Bryan Schumaker1c606fb2012-07-30 16:05:24 -04001943#if !IS_ENABLED(CONFIG_NFS_V3)
Chuck Lever5df36e72007-07-01 12:12:56 -04001944out_v3_not_compiled:
1945 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1946 return -EPROTONOSUPPORT;
1947#endif /* !CONFIG_NFS_V3 */
1948
Cyrill Gorcunov63649bd2008-04-17 20:42:09 +04001949out_nomem:
1950 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1951 return -ENOMEM;
1952
Chuck Lever5df36e72007-07-01 12:12:56 -04001953out_no_address:
1954 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1955 return -EINVAL;
1956
1957out_invalid_fh:
1958 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1959 return -EINVAL;
David Howells54ceac42006-08-22 20:06:13 -04001960}
1961
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001962#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerd72c7272012-05-10 15:07:41 -04001963static int nfs_validate_mount_data(struct file_system_type *fs_type,
1964 void *options,
1965 struct nfs_parsed_mount_data *args,
1966 struct nfs_fh *mntfh,
1967 const char *dev_name)
1968{
1969 if (fs_type == &nfs_fs_type)
1970 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1971 return nfs4_validate_mount_data(options, args, dev_name);
1972}
1973#else
1974static int nfs_validate_mount_data(struct file_system_type *fs_type,
1975 void *options,
1976 struct nfs_parsed_mount_data *args,
1977 struct nfs_fh *mntfh,
1978 const char *dev_name)
1979{
1980 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1981}
1982#endif
1983
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04001984static int nfs_validate_text_mount_data(void *options,
1985 struct nfs_parsed_mount_data *args,
1986 const char *dev_name)
1987{
1988 int port = 0;
1989 int max_namelen = PAGE_SIZE;
1990 int max_pathlen = NFS_MAXPATHLEN;
1991 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1992
1993 if (nfs_parse_mount_options((char *)options, args) == 0)
1994 return -EINVAL;
1995
1996 if (!nfs_verify_server_address(sap))
1997 goto out_no_address;
1998
1999 if (args->version == 4) {
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002000#if IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002001 port = NFS_PORT;
2002 max_namelen = NFS4_MAXNAMLEN;
2003 max_pathlen = NFS4_MAXPATHLEN;
2004 nfs_validate_transport_protocol(args);
2005 nfs4_validate_mount_flags(args);
2006#else
2007 goto out_v4_not_compiled;
2008#endif /* CONFIG_NFS_V4 */
2009 } else
2010 nfs_set_mount_transport_protocol(args);
2011
2012 nfs_set_port(sap, &args->nfs_server.port, port);
2013
2014 if (args->auth_flavor_len > 1)
2015 goto out_bad_auth;
2016
2017 return nfs_parse_devname(dev_name,
2018 &args->nfs_server.hostname,
2019 max_namelen,
2020 &args->nfs_server.export_path,
2021 max_pathlen);
2022
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002023#if !IS_ENABLED(CONFIG_NFS_V4)
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002024out_v4_not_compiled:
2025 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2026 return -EPROTONOSUPPORT;
2027#endif /* !CONFIG_NFS_V4 */
2028
2029out_no_address:
2030 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2031 return -EINVAL;
2032
2033out_bad_auth:
2034 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2035 return -EINVAL;
2036}
2037
Jeff Layton48b605f2008-06-10 15:38:39 -04002038static int
2039nfs_compare_remount_data(struct nfs_server *nfss,
2040 struct nfs_parsed_mount_data *data)
2041{
2042 if (data->flags != nfss->flags ||
2043 data->rsize != nfss->rsize ||
2044 data->wsize != nfss->wsize ||
2045 data->retrans != nfss->client->cl_timeout->to_retries ||
2046 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2047 data->acregmin != nfss->acregmin / HZ ||
2048 data->acregmax != nfss->acregmax / HZ ||
2049 data->acdirmin != nfss->acdirmin / HZ ||
2050 data->acdirmax != nfss->acdirmax / HZ ||
2051 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
Trond Myklebustbcd2ea12009-10-06 15:41:22 -04002052 data->nfs_server.port != nfss->port ||
Jeff Layton48b605f2008-06-10 15:38:39 -04002053 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
Stefan Richtera1be9ee2009-10-12 11:26:12 -04002054 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2055 (struct sockaddr *)&nfss->nfs_client->cl_addr))
Jeff Layton48b605f2008-06-10 15:38:39 -04002056 return -EINVAL;
2057
2058 return 0;
2059}
2060
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002061int
Jeff Layton48b605f2008-06-10 15:38:39 -04002062nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2063{
2064 int error;
2065 struct nfs_server *nfss = sb->s_fs_info;
2066 struct nfs_parsed_mount_data *data;
2067 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2068 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
Trond Myklebustcd100722008-06-17 16:12:00 -04002069 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
Jeff Layton48b605f2008-06-10 15:38:39 -04002070
2071 /*
2072 * Userspace mount programs that send binary options generally send
2073 * them populated with default values. We have no way to know which
2074 * ones were explicitly specified. Fall back to legacy behavior and
2075 * just return success.
2076 */
Marc Zyngier31c94462008-07-17 13:21:55 +02002077 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2078 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2079 options->version <= 6))))
Jeff Layton48b605f2008-06-10 15:38:39 -04002080 return 0;
2081
2082 data = kzalloc(sizeof(*data), GFP_KERNEL);
2083 if (data == NULL)
2084 return -ENOMEM;
2085
2086 /* fill out struct with values from existing mount */
2087 data->flags = nfss->flags;
2088 data->rsize = nfss->rsize;
2089 data->wsize = nfss->wsize;
2090 data->retrans = nfss->client->cl_timeout->to_retries;
2091 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2092 data->acregmin = nfss->acregmin / HZ;
2093 data->acregmax = nfss->acregmax / HZ;
2094 data->acdirmin = nfss->acdirmin / HZ;
2095 data->acdirmax = nfss->acdirmax / HZ;
2096 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
Trond Myklebustbcd2ea12009-10-06 15:41:22 -04002097 data->nfs_server.port = nfss->port;
Jeff Layton48b605f2008-06-10 15:38:39 -04002098 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2099 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2100 data->nfs_server.addrlen);
2101
2102 /* overwrite those values with any that were specified */
2103 error = nfs_parse_mount_options((char *)options, data);
2104 if (error < 0)
2105 goto out;
2106
Jeff Layton26c4c172011-04-27 11:49:09 -04002107 /*
2108 * noac is a special case. It implies -o sync, but that's not
2109 * necessarily reflected in the mtab options. do_remount_sb
2110 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2111 * remount options, so we have to explicitly reset it.
2112 */
2113 if (data->flags & NFS_MOUNT_NOAC)
2114 *flags |= MS_SYNCHRONOUS;
2115
Jeff Layton48b605f2008-06-10 15:38:39 -04002116 /* compare new mount options with old ones */
2117 error = nfs_compare_remount_data(nfss, data);
2118out:
2119 kfree(data);
2120 return error;
2121}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002122EXPORT_SYMBOL_GPL(nfs_remount);
Jeff Layton48b605f2008-06-10 15:38:39 -04002123
David Howells54ceac42006-08-22 20:06:13 -04002124/*
2125 * Initialise the common bits of the superblock
2126 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002127inline void nfs_initialise_sb(struct super_block *sb)
David Howells54ceac42006-08-22 20:06:13 -04002128{
2129 struct nfs_server *server = NFS_SB(sb);
2130
2131 sb->s_magic = NFS_SUPER_MAGIC;
2132
2133 /* We probably want something more informative here */
2134 snprintf(sb->s_id, sizeof(sb->s_id),
Vivek Trivedi5a7c9ee2012-03-15 23:58:52 +05302135 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
David Howells54ceac42006-08-22 20:06:13 -04002136
2137 if (sb->s_blocksize == 0)
2138 sb->s_blocksize = nfs_block_bits(server->wsize,
2139 &sb->s_blocksize_bits);
2140
Jens Axboe32a88aa2009-09-16 15:02:33 +02002141 sb->s_bdi = &server->backing_dev_info;
2142
David Howells54ceac42006-08-22 20:06:13 -04002143 nfs_super_set_maxbytes(sb, server->maxfilesize);
2144}
2145
2146/*
2147 * Finish setting up an NFS2/3 superblock
2148 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002149void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
David Howells54ceac42006-08-22 20:06:13 -04002150{
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002151 struct nfs_parsed_mount_data *data = mount_info->parsed;
David Howells54ceac42006-08-22 20:06:13 -04002152 struct nfs_server *server = NFS_SB(sb);
2153
2154 sb->s_blocksize_bits = 0;
2155 sb->s_blocksize = 0;
Bryan Schumaker6a744902012-07-30 16:05:20 -04002156 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2157 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2158 if (data && data->bsize)
David Howells54ceac42006-08-22 20:06:13 -04002159 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2160
Bryan Schumaker6a744902012-07-30 16:05:20 -04002161 if (server->nfs_client->rpc_ops->version != 2) {
David Howells54ceac42006-08-22 20:06:13 -04002162 /* The VFS shouldn't apply the umask to mode bits. We will do
2163 * so ourselves when necessary.
2164 */
2165 sb->s_flags |= MS_POSIXACL;
2166 sb->s_time_gran = 1;
2167 }
2168
David Howells54ceac42006-08-22 20:06:13 -04002169 nfs_initialise_sb(sb);
2170}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002171EXPORT_SYMBOL_GPL(nfs_fill_super);
David Howells54ceac42006-08-22 20:06:13 -04002172
2173/*
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002174 * Finish setting up a cloned NFS2/3/4 superblock
David Howells54ceac42006-08-22 20:06:13 -04002175 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002176void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
David Howells54ceac42006-08-22 20:06:13 -04002177{
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002178 const struct super_block *old_sb = mount_info->cloned->sb;
David Howells54ceac42006-08-22 20:06:13 -04002179 struct nfs_server *server = NFS_SB(sb);
2180
2181 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2182 sb->s_blocksize = old_sb->s_blocksize;
2183 sb->s_maxbytes = old_sb->s_maxbytes;
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002184 sb->s_xattr = old_sb->s_xattr;
2185 sb->s_op = old_sb->s_op;
2186 sb->s_time_gran = 1;
David Howells54ceac42006-08-22 20:06:13 -04002187
Bryan Schumaker3cadf4b2012-07-16 16:39:19 -04002188 if (server->nfs_client->rpc_ops->version != 2) {
David Howells54ceac42006-08-22 20:06:13 -04002189 /* The VFS shouldn't apply the umask to mode bits. We will do
2190 * so ourselves when necessary.
2191 */
2192 sb->s_flags |= MS_POSIXACL;
David Howells54ceac42006-08-22 20:06:13 -04002193 }
2194
David Howells54ceac42006-08-22 20:06:13 -04002195 nfs_initialise_sb(sb);
2196}
2197
Trond Myklebust275a5d22007-05-16 16:53:28 -04002198static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2199{
2200 const struct nfs_server *a = s->s_fs_info;
2201 const struct rpc_clnt *clnt_a = a->client;
2202 const struct rpc_clnt *clnt_b = b->client;
2203
2204 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2205 goto Ebusy;
2206 if (a->nfs_client != b->nfs_client)
2207 goto Ebusy;
2208 if (a->flags != b->flags)
2209 goto Ebusy;
2210 if (a->wsize != b->wsize)
2211 goto Ebusy;
2212 if (a->rsize != b->rsize)
2213 goto Ebusy;
2214 if (a->acregmin != b->acregmin)
2215 goto Ebusy;
2216 if (a->acregmax != b->acregmax)
2217 goto Ebusy;
2218 if (a->acdirmin != b->acdirmin)
2219 goto Ebusy;
2220 if (a->acdirmax != b->acdirmax)
2221 goto Ebusy;
2222 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2223 goto Ebusy;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002224 return 1;
Trond Myklebust275a5d22007-05-16 16:53:28 -04002225Ebusy:
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002226 return 0;
2227}
2228
2229struct nfs_sb_mountdata {
2230 struct nfs_server *server;
2231 int mntflags;
2232};
2233
2234static int nfs_set_super(struct super_block *s, void *data)
2235{
2236 struct nfs_sb_mountdata *sb_mntdata = data;
2237 struct nfs_server *server = sb_mntdata->server;
2238 int ret;
2239
2240 s->s_flags = sb_mntdata->mntflags;
2241 s->s_fs_info = server;
Al Viro8b244ff2010-12-18 11:29:39 -05002242 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002243 ret = set_anon_super(s, server);
2244 if (ret == 0)
2245 server->s_dev = s->s_dev;
2246 return ret;
2247}
2248
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002249static int nfs_compare_super_address(struct nfs_server *server1,
2250 struct nfs_server *server2)
2251{
2252 struct sockaddr *sap1, *sap2;
2253
2254 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2255 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2256
2257 if (sap1->sa_family != sap2->sa_family)
2258 return 0;
2259
2260 switch (sap1->sa_family) {
2261 case AF_INET: {
2262 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2263 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2264 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2265 return 0;
2266 if (sin1->sin_port != sin2->sin_port)
2267 return 0;
2268 break;
2269 }
2270 case AF_INET6: {
2271 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2272 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2273 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2274 return 0;
2275 if (sin1->sin6_port != sin2->sin6_port)
2276 return 0;
2277 break;
2278 }
2279 default:
2280 return 0;
2281 }
2282
2283 return 1;
2284}
2285
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002286static int nfs_compare_super(struct super_block *sb, void *data)
2287{
2288 struct nfs_sb_mountdata *sb_mntdata = data;
2289 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2290 int mntflags = sb_mntdata->mntflags;
2291
Chuck Leverfd00a8f2007-12-10 14:57:38 -05002292 if (!nfs_compare_super_address(old, server))
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002293 return 0;
2294 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2295 if (old->flags & NFS_MOUNT_UNSHARED)
2296 return 0;
2297 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2298 return 0;
2299 return nfs_compare_mount_options(sb, server, mntflags);
Trond Myklebust275a5d22007-05-16 16:53:28 -04002300}
2301
Trond Myklebust39ffb922012-05-16 10:21:30 -07002302#ifdef CONFIG_NFS_FSCACHE
Bryan Schumaker2311b942012-05-10 15:07:32 -04002303static void nfs_get_cache_cookie(struct super_block *sb,
2304 struct nfs_parsed_mount_data *parsed,
2305 struct nfs_clone_mount *cloned)
2306{
2307 char *uniq = NULL;
2308 int ulen = 0;
2309
2310 if (parsed && parsed->fscache_uniq) {
2311 uniq = parsed->fscache_uniq;
2312 ulen = strlen(parsed->fscache_uniq);
2313 } else if (cloned) {
2314 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2315 if (mnt_s->fscache_key) {
2316 uniq = mnt_s->fscache_key->key.uniquifier;
2317 ulen = mnt_s->fscache_key->key.uniq_len;
2318 };
2319 }
2320
2321 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2322}
Trond Myklebust39ffb922012-05-16 10:21:30 -07002323#else
2324static void nfs_get_cache_cookie(struct super_block *sb,
2325 struct nfs_parsed_mount_data *parsed,
2326 struct nfs_clone_mount *cloned)
2327{
2328}
2329#endif
Bryan Schumaker2311b942012-05-10 15:07:32 -04002330
Miklos Szeredifa799752008-04-30 00:54:33 -07002331static int nfs_bdi_register(struct nfs_server *server)
2332{
2333 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2334}
2335
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002336int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2337 struct nfs_mount_info *mount_info)
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002338{
2339 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2340}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002341EXPORT_SYMBOL_GPL(nfs_set_sb_security);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002342
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002343int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2344 struct nfs_mount_info *mount_info)
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002345{
2346 /* clone any lsm security options from the parent to the new sb */
2347 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2348 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2349 return -ESTALE;
2350 return 0;
2351}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002352EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002353
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002354struct dentry *nfs_fs_mount_common(struct nfs_server *server,
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002355 int flags, const char *dev_name,
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002356 struct nfs_mount_info *mount_info,
2357 struct nfs_subversion *nfs_mod)
David Howells54ceac42006-08-22 20:06:13 -04002358{
David Howells54ceac42006-08-22 20:06:13 -04002359 struct super_block *s;
Al Viro01194982011-03-16 07:25:36 -04002360 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Trond Myklebust75180df2007-05-16 16:53:28 -04002361 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002362 struct nfs_sb_mountdata sb_mntdata = {
2363 .mntflags = flags,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002364 .server = server,
Trond Myklebuste89a5a42007-08-31 10:45:17 -04002365 };
Al Viro01194982011-03-16 07:25:36 -04002366 int error;
David Howells54ceac42006-08-22 20:06:13 -04002367
Trond Myklebust75180df2007-05-16 16:53:28 -04002368 if (server->flags & NFS_MOUNT_UNSHARED)
2369 compare_super = NULL;
2370
Sachin Prabhufb2088c2011-08-01 12:10:12 +01002371 /* -o noac implies -o sync */
2372 if (server->flags & NFS_MOUNT_NOAC)
2373 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2374
David Howells54ceac42006-08-22 20:06:13 -04002375 /* Get a superblock - note that we may end up sharing one that already exists */
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002376 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
Trond Myklebust816724e2006-06-24 08:41:41 -04002377 if (IS_ERR(s)) {
Al Viro01194982011-03-16 07:25:36 -04002378 mntroot = ERR_CAST(s);
David Howells54ceac42006-08-22 20:06:13 -04002379 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -04002380 }
2381
David Howells54ceac42006-08-22 20:06:13 -04002382 if (s->s_fs_info != server) {
2383 nfs_free_server(server);
2384 server = NULL;
Miklos Szeredifa799752008-04-30 00:54:33 -07002385 } else {
2386 error = nfs_bdi_register(server);
Al Viro01194982011-03-16 07:25:36 -04002387 if (error) {
2388 mntroot = ERR_PTR(error);
NeilBrowncfbc0682010-03-11 11:20:17 +11002389 goto error_splat_bdi;
Al Viro01194982011-03-16 07:25:36 -04002390 }
David Howellsf7b422b2006-06-09 09:34:33 -04002391 }
David Howells54ceac42006-08-22 20:06:13 -04002392
2393 if (!s->s_root) {
2394 /* initial superblock/root creation */
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002395 mount_info->fill_super(s, mount_info);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002396 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
David Howells54ceac42006-08-22 20:06:13 -04002397 }
2398
Bryan Schumaker87c70832012-05-10 15:07:43 -04002399 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
Al Viro01194982011-03-16 07:25:36 -04002400 if (IS_ERR(mntroot))
David Howells54ceac42006-08-22 20:06:13 -04002401 goto error_splat_super;
David Howells54ceac42006-08-22 20:06:13 -04002402
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002403 error = mount_info->set_security(s, mntroot, mount_info);
Eric Parisf9c3a382008-03-05 14:20:18 -05002404 if (error)
2405 goto error_splat_root;
2406
David Howellsf7b422b2006-06-09 09:34:33 -04002407 s->s_flags |= MS_ACTIVE;
Chuck Lever06559602007-07-01 12:12:35 -04002408
2409out:
Al Viro01194982011-03-16 07:25:36 -04002410 return mntroot;
Trond Myklebust816724e2006-06-24 08:41:41 -04002411
David Howells54ceac42006-08-22 20:06:13 -04002412out_err_nosb:
2413 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -04002414 goto out;
David Howells54ceac42006-08-22 20:06:13 -04002415
Eric Parisf9c3a382008-03-05 14:20:18 -05002416error_splat_root:
2417 dput(mntroot);
Al Viro01194982011-03-16 07:25:36 -04002418 mntroot = ERR_PTR(error);
David Howells54ceac42006-08-22 20:06:13 -04002419error_splat_super:
NeilBrowncfbc0682010-03-11 11:20:17 +11002420 if (server && !s->s_root)
2421 bdi_unregister(&server->backing_dev_info);
2422error_splat_bdi:
Al Viro6f5bbff2009-05-06 01:34:22 -04002423 deactivate_locked_super(s);
Chuck Lever06559602007-07-01 12:12:35 -04002424 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002425}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002426EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
David Howellsf7b422b2006-06-09 09:34:33 -04002427
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002428struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002429 int flags, const char *dev_name, void *raw_data)
2430{
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002431 struct nfs_mount_info mount_info = {
2432 .fill_super = nfs_fill_super,
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002433 .set_security = nfs_set_sb_security,
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002434 };
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002435 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002436 struct nfs_subversion *nfs_mod;
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002437 int error;
2438
Bryan Schumaker46058d42012-05-10 15:07:42 -04002439 mount_info.parsed = nfs_alloc_parsed_mount_data();
Bryan Schumaker87c70832012-05-10 15:07:43 -04002440 mount_info.mntfh = nfs_alloc_fhandle();
2441 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002442 goto out;
2443
2444 /* Validate the mount data */
Bryan Schumaker87c70832012-05-10 15:07:43 -04002445 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002446 if (error == NFS_TEXT_DATA)
Bryan Schumaker46058d42012-05-10 15:07:42 -04002447 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002448 if (error < 0) {
2449 mntroot = ERR_PTR(error);
2450 goto out;
2451 }
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002452
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002453 nfs_mod = get_nfs_version(mount_info.parsed->version);
2454 if (IS_ERR(nfs_mod)) {
2455 mntroot = ERR_CAST(nfs_mod);
2456 goto out;
2457 }
2458
Bryan Schumakerff9099f22012-07-30 16:05:18 -04002459 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002460
2461 put_nfs_version(nfs_mod);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002462out:
Bryan Schumaker46058d42012-05-10 15:07:42 -04002463 nfs_free_parsed_mount_data(mount_info.parsed);
Bryan Schumaker87c70832012-05-10 15:07:43 -04002464 nfs_free_fhandle(mount_info.mntfh);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002465 return mntroot;
2466}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002467EXPORT_SYMBOL_GPL(nfs_fs_mount);
Bryan Schumakerc40f8d12012-05-10 15:07:34 -04002468
David Howells54ceac42006-08-22 20:06:13 -04002469/*
Trond Myklebust387c1492010-02-03 08:27:35 -05002470 * Ensure that we unregister the bdi before kill_anon_super
2471 * releases the device name
2472 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002473void nfs_put_super(struct super_block *s)
Trond Myklebust387c1492010-02-03 08:27:35 -05002474{
2475 struct nfs_server *server = NFS_SB(s);
2476
2477 bdi_unregister(&server->backing_dev_info);
2478}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002479EXPORT_SYMBOL_GPL(nfs_put_super);
Trond Myklebust387c1492010-02-03 08:27:35 -05002480
2481/*
David Howells54ceac42006-08-22 20:06:13 -04002482 * Destroy an NFS2/3 superblock
2483 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002484void nfs_kill_super(struct super_block *s)
David Howellsf7b422b2006-06-09 09:34:33 -04002485{
2486 struct nfs_server *server = NFS_SB(s);
2487
2488 kill_anon_super(s);
David Howells08734042009-04-03 16:42:42 +01002489 nfs_fscache_release_super_cookie(s);
David Howells54ceac42006-08-22 20:06:13 -04002490 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -04002491}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002492EXPORT_SYMBOL_GPL(nfs_kill_super);
David Howellsf7b422b2006-06-09 09:34:33 -04002493
David Howells54ceac42006-08-22 20:06:13 -04002494/*
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002495 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
David Howells54ceac42006-08-22 20:06:13 -04002496 */
Bryan Schumakerfbdefd62012-07-16 16:39:20 -04002497struct dentry *
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002498nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2499 const char *dev_name, void *raw_data)
David Howellsf7b422b2006-06-09 09:34:33 -04002500{
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002501 struct nfs_clone_mount *data = raw_data;
2502 struct nfs_mount_info mount_info = {
2503 .fill_super = nfs_clone_super,
2504 .set_security = nfs_clone_sb_security,
2505 .cloned = data,
2506 };
David Howells54ceac42006-08-22 20:06:13 -04002507 struct nfs_server *server;
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002508 struct dentry *mntroot = ERR_PTR(-ENOMEM);
Bryan Schumakerab7017a2012-07-30 16:05:16 -04002509 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
David Howells54ceac42006-08-22 20:06:13 -04002510 int error;
2511
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002512 dprintk("--> nfs_xdev_mount_common()\n");
David Howells54ceac42006-08-22 20:06:13 -04002513
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002514 mount_info.mntfh = mount_info.cloned->fh;
Bryan Schumaker87c70832012-05-10 15:07:43 -04002515
David Howells54ceac42006-08-22 20:06:13 -04002516 /* create a new volume representation */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04002517 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
David Howells54ceac42006-08-22 20:06:13 -04002518 if (IS_ERR(server)) {
2519 error = PTR_ERR(server);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002520 goto out_err;
David Howells54ceac42006-08-22 20:06:13 -04002521 }
2522
Bryan Schumakere8f25e62012-07-30 16:05:17 -04002523 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002524 dprintk("<-- nfs_xdev_mount_common() = 0\n");
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002525out:
Al Viro31f43472010-10-29 03:38:12 -04002526 return mntroot;
David Howells54ceac42006-08-22 20:06:13 -04002527
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002528out_err:
Bryan Schumaker8c958e02012-05-10 15:07:35 -04002529 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
Bryan Schumaker3d176e32012-05-10 15:07:36 -04002530 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -04002531}
2532
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002533#if IS_ENABLED(CONFIG_NFS_V4)
David Howells54ceac42006-08-22 20:06:13 -04002534
Trond Myklebust01c3f052009-06-17 13:22:58 -07002535static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2536{
Suresh Jayaraman5eebde22010-09-23 08:55:58 -04002537 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2538 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
Trond Myklebust01c3f052009-06-17 13:22:58 -07002539}
2540
David Howells54ceac42006-08-22 20:06:13 -04002541/*
Chuck Leverf0768eb2007-07-01 12:13:01 -04002542 * Validate NFSv4 mount options
2543 */
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002544static int nfs4_validate_mount_data(void *options,
2545 struct nfs_parsed_mount_data *args,
2546 const char *dev_name)
Chuck Leverf0768eb2007-07-01 12:13:01 -04002547{
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002548 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002549 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002550 char *c;
2551
2552 if (data == NULL)
2553 goto out_no_data;
2554
Bryan Schumakercdf66442012-06-05 14:59:54 -04002555 args->version = 4;
2556
Chuck Leverf0768eb2007-07-01 12:13:01 -04002557 switch (data->version) {
2558 case 1:
Chuck Lever4c568012007-12-10 14:59:28 -05002559 if (data->host_addrlen > sizeof(args->nfs_server.address))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002560 goto out_no_address;
Chuck Lever4c568012007-12-10 14:59:28 -05002561 if (data->host_addrlen == 0)
2562 goto out_no_address;
2563 args->nfs_server.addrlen = data->host_addrlen;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002564 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002565 return -EFAULT;
Chuck Lever4cfd74f2009-09-08 19:49:47 -04002566 if (!nfs_verify_server_address(sap))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002567 goto out_no_address;
Trond Myklebust872ece82012-09-04 11:05:07 -04002568 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002569
Chuck Lever6738b252008-06-24 16:33:54 -04002570 if (data->auth_flavourlen) {
2571 if (data->auth_flavourlen > 1)
2572 goto out_inval_auth;
Trond Myklebust20c71f52007-09-20 20:23:51 -04002573 if (copy_from_user(&args->auth_flavors[0],
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002574 data->auth_flavours,
Trond Myklebust20c71f52007-09-20 20:23:51 -04002575 sizeof(args->auth_flavors[0])))
Chuck Leverf0768eb2007-07-01 12:13:01 -04002576 return -EFAULT;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002577 }
2578
2579 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2580 if (IS_ERR(c))
2581 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002582 args->nfs_server.hostname = c;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002583
2584 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2585 if (IS_ERR(c))
2586 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002587 args->nfs_server.export_path = c;
2588 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002589
2590 c = strndup_user(data->client_addr.data, 16);
2591 if (IS_ERR(c))
2592 return PTR_ERR(c);
\"Talpey, Thomas\91ea40b2007-09-10 13:44:33 -04002593 args->client_address = c;
2594
2595 /*
2596 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2597 * can deal with.
2598 */
2599
2600 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2601 args->rsize = data->rsize;
2602 args->wsize = data->wsize;
2603 args->timeo = data->timeo;
2604 args->retrans = data->retrans;
2605 args->acregmin = data->acregmin;
2606 args->acregmax = data->acregmax;
2607 args->acdirmin = data->acdirmin;
2608 args->acdirmax = data->acdirmax;
2609 args->nfs_server.protocol = data->proto;
Trond Myklebust259875e2008-07-02 14:43:47 -04002610 nfs_validate_transport_protocol(args);
Chuck Leverf0768eb2007-07-01 12:13:01 -04002611
2612 break;
Chuck Lever7630c852009-09-08 19:49:57 -04002613 default:
Bryan Schumakerb72e4f42012-05-10 15:07:40 -04002614 return NFS_TEXT_DATA;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002615 }
2616
2617 return 0;
2618
2619out_no_data:
2620 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2621 return -EINVAL;
2622
2623out_inval_auth:
2624 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2625 data->auth_flavourlen);
2626 return -EINVAL;
2627
2628out_no_address:
2629 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2630 return -EINVAL;
Chuck Leverf0768eb2007-07-01 12:13:01 -04002631}
2632
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002633/*
2634 * NFS v4 module parameters need to stay in the
2635 * NFS client for backwards compatibility
2636 */
2637unsigned int nfs_callback_set_tcpport;
2638unsigned short nfs_callback_tcpport;
2639/* Default cache timeout is 10 minutes */
2640unsigned int nfs_idmap_cache_timeout = 600;
2641/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2642bool nfs4_disable_idmapping = true;
2643unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2644unsigned short send_implementation_id = 1;
2645
Bryan Schumaker89d77c82012-07-30 16:05:25 -04002646EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2647EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2648EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2649EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2650EXPORT_SYMBOL_GPL(max_session_slots);
2651EXPORT_SYMBOL_GPL(send_implementation_id);
2652
Bryan Schumakerfac1e8e2012-07-30 16:05:22 -04002653#define NFS_CALLBACK_MAXPORTNR (65535U)
2654
2655static int param_set_portnr(const char *val, const struct kernel_param *kp)
2656{
2657 unsigned long num;
2658 int ret;
2659
2660 if (!val)
2661 return -EINVAL;
2662 ret = strict_strtoul(val, 0, &num);
2663 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2664 return -EINVAL;
2665 *((unsigned int *)kp->arg) = num;
2666 return 0;
2667}
2668static struct kernel_param_ops param_ops_portnr = {
2669 .set = param_set_portnr,
2670 .get = param_get_uint,
2671};
2672#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2673
2674module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2675module_param(nfs_idmap_cache_timeout, int, 0644);
2676module_param(nfs4_disable_idmapping, bool, 0644);
2677MODULE_PARM_DESC(nfs4_disable_idmapping,
2678 "Turn off NFSv4 idmapping when using 'sec=sys'");
2679module_param(max_session_slots, ushort, 0644);
2680MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2681 "requests the client will negotiate");
2682module_param(send_implementation_id, ushort, 0644);
2683MODULE_PARM_DESC(send_implementation_id,
2684 "Send implementation ID with NFSv4.1 exchange_id");
bjschuma@gmail.com425e7762012-08-08 13:57:10 -04002685MODULE_ALIAS("nfs4");
2686
David Howells54ceac42006-08-22 20:06:13 -04002687#endif /* CONFIG_NFS_V4 */